RFC 839 UNKNOWN SURVEY · NETWORK HOSTS · TCP
Who talks TCP?
An updated survey of TCP support on Internet hosts from January 1983.
RFC EDITOR
Smallberg, D., "Who talks TCP?", RFC 839, DOI 10.17487/RFC0839, January 1983, <https://www.rfc-editor.org/info/rfc839>.
BIBTEX
@misc{rfc839,
series = {Request for Comments},
number = 839,
howpublished = {RFC 839},
publisher = {RFC Editor},
doi = {10.17487/RFC0839},
url = {https://www.rfc-editor.org/info/rfc839},
author = {D. Smallberg},
title = {{Who talks TCP?}},
pagetotal = 14,
year = 1983,
month = jan,
} LINEAGE · FROM THE RFC INDEXOpen full graph →
RFC text
Network Working Group D. Smallberg
Request for Comments: 839 January 1983
Who Talks TCP?
The list of hosts was taken from the NIC hostname table of 31-Dec-82.
The tests were run on 25-Jan-83 from ~10:00 am to ~6:30 pm PST.
Dead, refused, and unreachable hosts were retried 26-Jan-83 from ~8:00 am
to ~6:10 pm PST.
Claims are taken from the NIC host table:
T = tcp (no particular services mentioned)
t = tcp/telnet
f = tcp/ftp
s = tcp/smtp
Results for each service:
blank (not accepted)
refused
unreachable
dead
accepted
accepted+ (FTP allowed user anonymous, password guest)
Summary information:
Telnet Result
no telnet unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/telnet | 9 | 6 | 2 | 20 | 110 | 147
l +-----------+-------------+---------+------+------------+
a tcp | 7 | 1 | 0 | 3 | 16 | 27
i +-----------+-------------+---------+------+------------+
m Nothing | 58 | 4 | 1 | 30 | 56 | 149
+-----------+-------------+---------+------+------------+----
74 11 3 53 182 | 323
FTP Result
accepted or
no tcp/ftp unreachable refused dead accepted+
+-----------+-------------+---------+------+------------+
C tcp/ftp | 10 | 6 | 2 | 18 | 84 | 120
l +-----------+-------------+---------+------+------------+
a tcp | 8 | 1 | 2 | 3 | 13 | 27
i +-----------+-------------+---------+------+------------+
m Nothing | 64 | 4 | 8 | 32 | 68 | 176
+-----------+-------------+---------+------+------------+----
82 11 12 53 165 | 323
SMTP Result
no tcp/smtp unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/smtp | 2 | 6 | 1 | 19 | 82 | 110
l +-----------+-------------+---------+------+------------+
a tcp | 9 | 1 | 2 | 3 | 12 | 27
i +-----------+-------------+---------+------+------------+
m Nothing | 76 | 4 | 10 | 31 | 65 | 186
+-----------+-------------+---------+------+------------+----
87 11 13 53 159 | 323
Results in alphabetical order:
Name Address Claims Telnet FTP SMTP
---- ------- ------ ------ --- ----
acc 10.2.0.54 ---- d e a d
ada-vax 10.0.0.52 ---- accepted accepted accepted
aerospace 10.2.0.65 T--- accepted accepted accepted
afgl 10.1.0.66 ---- accepted accepted
afsc-ad 10.0.0.53 T--- accepted accepted
afsc-dev 10.2.0.53 ---- accepted accepted
afsc-hq 10.0.0.67 ----
afsc-sd 10.0.0.65 ----
afwl 10.0.0.48 ---- accepted accepted
aids-unix 10.3.0.56 ---- u n r e a c h a b l e
alta-coma 3.1.0.50 T---
ames-tss 10.0.0.16 ---- accepted accepted accepted
ames-vmsb 10.3.0.16 ----
anl 10.0.0.55 ----
anl-mcs 10.1.0.55 ---- accepted accepted accepted
arpa-dms 10.0.0.28 ---- d e a d
arpa-png11 10.3.0.28 ----
bbn-admin 3.1.0.6 -tfs accepted accepted accepted
bbn-cd 3.3.0.9 -tfs accepted accepted accepted
bbn-clxx 10.2.0.71 -tfs u n r e a c h a b l e
bbn-inoc 10.2.0.82 ----
bbn-inoc 3.2.0.6 -tfs accepted accepted accepted
bbn-noc 3.1.0.14 -tfs accepted accepted accepted
bbn-noc2 10.6.0.82 -tfs accepted accepted accepted
bbn-nu 10.0.0.72 ---s
bbn-rsm 10.4.0.82 -t-- accepted
bbn-tenexb 10.0.0.49 -t-- accepted accepted+ accepted
bbn-tenexc 10.3.0.49 -t-- accepted refused accepted
bbn-unix 10.1.0.72 ---- accepted accepted accepted
bbn-unix 3.1.0.4 -tfs accepted accepted accepted
bbn-vax 10.1.0.82 -tfs accepted accepted accepted
bbna 10.3.0.5 -tf- accepted accepted accepted
bbncca 3.0.0.2 -tfs accepted accepted accepted
bbnccb 3.1.0.2 -tfs accepted accepted accepted
bbnccc 3.2.0.2 -tfs accepted accepted accepted
bbnccd 3.3.0.2 -tfs accepted accepted accepted
bbnccf 3.0.0.4 -tfs accepted accepted accepted
bbncci 3.3.0.4 -tfs accepted accepted accepted
bbnf 10.0.0.5 -tf- accepted accepted accepted
bbng 10.1.0.5 -tf- accepted accepted accepted
bbnp 10.2.0.72 -tfs accepted accepted accepted
bbnq 3.2.0.7 -tfs accepted accepted accepted
bbns 10.3.0.82 -tfs accepted accepted accepted
bbnt 10.0.0.82 ---- accepted accepted accepted
bbnt 3.1.0.7 -tfs accepted accepted accepted
bbnt 3.3.0.7 -tfs accepted accepted accepted
bbnw 3.3.0.6 -tfs accepted accepted accepted
bbnx 3.0.0.8 -tfs accepted accepted accepted
bbny 3.2.0.8 -tfs accepted accepted accepted
bnl 10.1.0.58 ---- d e a d
bragg-sta1 10.1.0.38 -t-- d e a d
brl 10.0.0.29 ---- accepted accepted accepted
brl-bmd 10.3.0.29 ---- accepted accepted refused
cca-unix 10.0.0.31 ---- u n r e a c h a b l e
cca-vms 10.1.0.31 T--- u n r e a c h a b l e
cctc 10.0.0.20 -t-- d e a d
centacs-mmp 10.0.0.60 ---- d e a d
centacs-tf 10.3.0.60 ---- d e a d
cincpacflt-wm 10.1.0.36 ----
cit-20 10.0.0.54 T--- accepted accepted accepted
cit-750 192.5.7.3 -tfs u n r e a c h a b l e
cit-vax 10.1.0.54 -tfs accepted accepted accepted
clarksburg-expak 8.0.0.4 ----
clarksburg-monitor 8.0.0.44 ---- d e a d
cmu 128.2.254.255 ---s d e a d
cmu-cs-a 10.1.0.14 -t-s accepted accepted accepted
cmu-cs-b 10.0.0.14 ----
cmu-cs-c 10.3.0.14 ---- accepted accepted+ accepted
cmu-cs-cad 128.2.254.133 -tfs accepted accepted accepted
cmu-cs-g 128.2.254.132 -tfs accepted accepted accepted
cmu-cs-gandalf 128.2.254.140 -tfs accepted accepted accepted
cmu-cs-ius 128.2.254.128 -tfs accepted accepted accepted
cmu-cs-j 128.2.254.144 -tfs d e a d
cmu-cs-k 128.2.254.136 -tfs d e a d
cmu-cs-ps 128.2.254.130 ---- d e a d
cmu-cs-pt 128.2.254.155 -tfs accepted accepted accepted
cmu-cs-speech 128.2.254.145 -tfs accepted accepted accepted
cmu-cs-spice 128.2.254.139 -tfs accepted accepted accepted
cmu-cs-unh 128.2.254.150 -tfs accepted accepted accepted
cmu-cs-vlsi 128.2.254.129 -tfs accepted accepted accepted
cmu-cs-zog 128.2.254.131 -tfs accepted accepted accepted
cmu-ri-fas 128.2.254.138 -tfs accepted accepted accepted
cmu-ri-isl 128.2.254.143 -tfs accepted accepted accepted
cmu-ri-isl2 128.2.254.152 -tfs accepted accepted accepted
cmu-ri-leg 128.2.254.141 -tfs d e a d
coins-gateway 10.1.0.57 ----
coins-tas 10.0.0.36 ----
collins-gw 10.1.0.46 T---
collins-pr 10.0.0.46 T--- d e a d
compion 10.1.0.12 ---- accepted refused refused
compion-vms 10.0.0.12 ---s accepted accepted accepted
cornell 10.3.0.96 -tfs accepted accepted accepted
csnet-cic 3.0.0.14 -tfs accepted accepted accepted
csnet-purdue 128.10.0.2 -tfs accepted accepted accepted
csnet-sh 10.1.0.94 ---- accepted accepted+ accepted
csnet-sh 192.5.2.3 T--- accepted accepted+ accepted
dca-ems 10.4.0.20 ---- accepted accepted accepted
dcn1 128.4.0.1 -tfs accepted accepted+ accepted
dcn2 128.4.0.2 -tfs accepted accepted+ accepted
dcn3 128.4.0.3 -tfs accepted accepted+ accepted
dcn4 128.4.0.4 -tfs d e a d
dcn5 128.4.0.5 -tfs accepted accepted+ accepted
dcn6 128.4.0.6 -tfs accepted accepted+ accepted
dcn7 128.4.0.7 -tfs d e a d
dcn8 128.4.0.8 -tfs d e a d
dcn9 128.4.0.9 -tfs d e a d
dec-2136 10.0.0.79 T--- d e a d
dec-marlboro 10.1.0.79 T--- accepted accepted accepted
dfvlr1 128.7.0.1 -tfs u n r e a c h a b l e
dfvlr2 128.7.0.2 -tfs u n r e a c h a b l e
dfvlr3 128.7.0.3 -tfs u n r e a c h a b l e
dfvlr7 128.7.0.7 -tfs u n r e a c h a b l e
dtnsrdc 10.0.0.81 ---- accepted accepted accepted
edn-host1 21.1.0.1 -tfs d e a d
edn-unix 10.3.0.20 -tfs accepted accepted
etac 10.0.0.59 ---- d e a d
etam-expak 4.0.0.1 ----
etam-monitor 4.0.0.41 ----
fnoc 10.1.0.33 ---- d e a d
fnoc-secure 10.3.0.33 ----
ford-ecc 128.5.0.11 -tfs accepted accepted+ accepted
ford-eed 128.5.0.14 -tfs accepted accepted+ accepted
ford-ers 128.5.0.13 -tfs accepted accepted+ accepted
ford-foe 128.5.0.15 -tfs d e a d
ford-lab 128.5.0.8 -tfs accepted accepted+ accepted
ford-res 128.5.0.10 -tfs d e a d
ford-srl 128.5.0.12 -tfs d e a d
ford-vax 128.5 .0.9 -tfs d e a d
ford-wdl1 128.5.32.1 -tfs accepted accepted accepted
ford-wdl2 128.5.32.2 -tfs d e a d
ford-wdl3 128.5.32.3 -tfs d e a d
ford-wdl4 128.5.32.4 -tfs d e a d
ford-wdl5 128.5.32.5 -tfs d e a d
ford-wdl6 128.5.32.6 -t-- accepted accepted accepted
ford1 128.5.0.1 -tfs accepted accepted+ accepted
ford2 128.5.0.2 -tfs accepted accepted+ accepted
ford3 128.5.0.3 -tfs accepted accepted+ accepted
ford4 128.5.0.4 -tfs accepted accepted+ accepted
fucino 4.0.0.88 ----
fucino-expak 4.0.0.95 ----
fucino-monitor 4.0.0.94 ----
goonhilly-expak 4.0.0.2 ----
goonhilly-monitor 4.0.0.42 ----
gunter-adam 10.1.0.13 ---- accepted accepted+ accepted
gunter-unix 10.0.0.13 ----
harv-10 10.0.0.9 ----
hi-multics 10.0.0.80 ---- accepted accepted accepted
isi-png11 10.1.0.27 ----
isi-speech11 10.0.0.22 ----
isi-vaxa 10.2.0.27 -t-- accepted accepted accepted
jpl-vax 10.3.0.54 ---- d e a d
kestrel 10.3.0.32 ----
lbl 10.0.0.34 ----
lbl-csam 10.1.0.34 ---s accepted accepted+ accepted
ll 10.0.0.10 ---- accepted accepted accepted
ll-11 10.3.0.10 ----
ll-asg 10.1.0.44 ---- d e a d
ll-en 10.4.0.10 -tfs accepted accepted accepted
ll-iptcp 10.3.44.10 T---
ll-tcp 10.1.0.10 T--- accepted accepted accepted
ll-xn 10.2.0.10 ---- d e a d
lll-mfe 10.1.0.21 ----
lll-unix 10.0.0.21 ---- d e a d
logicon 10.2.0.3 ---- d e a d
martin 10.3.0.53 ----
martin-b 10.1.0.64 -tfs accepted accepted accepted
mcclellan 10.3.0.78 ---- accepted
mit-ai 10.2.0.6 ---- accepted accepted+ accepted
mit-ajax 18.10.0.64 -tf- accepted accepted accepted
mit-cls 18.10.0.76 -tfs accepted accepted accepted
mit-csr 18.10.0.8 ---s accepted accepted
mit-devmultics 10.1.0.77 -t-s accepted accepted accepted
mit-dms 10.1.0.6 ---- accepted accepted+
mit-mc 10.3.0.44 ---- accepted accepted+ accepted
mit-ml 10.3.0.6 ---- accepted accepted+ accepted
mit-multics 10.0.0.6 -t-s accepted accepted accepted
mit-tstgw 10.2.0.44 T--- d e a d
mit-xx 10.0.0.44 ---- accepted accepted+ refused
mitre 10.0.0.17 T--- accepted accepted accepted
mitre-bedford 10.0.0.66 ----
nadc 10.2.0.24 ---- u n r e a c h a b l e
nadc-vax 10.0.0.24 -tfs accepted accepted accepted
nalcon 10.1.0.81 ---- accepted accepted accepted
nbs-pl 10.3.0.19 ----
nbs-sdc 10.1.0.19 ---- accepted accepted+ accepted
nbs-unix 10.2.0.19 ---- d e a d
nbs-vms 10.0.0.19 ---- accepted accepted accepted
ncsc 10.1.0.53 ---- d e a d
ndre1 48.3.1.41 -tfs accepted accepted+ accepted
nlm-mcs 10.0.0.88 ---- accepted accepted accepted
nosc-cc 10.0.0.3 -tfs accepted accepted accepted
nosc-sdl 10.1.0.35 ----
nosc-secure2 10.0.0.35 ----
nosc-secure3 10.3.0.35 ---- d e a d
nosc-spel 10.1.0.3 ---- d e a d
nprdc 10.3.0.3 -tfs accepted accepted accepted
nps 10.0.0.33 T---
nrl 10.0.0.8 ---- accepted accepted accepted
nrl-aic 10.1.0.8 T--- accepted accepted accepted
nrl-css 10.7.0.8 ---- accepted accepted accepted
nrl-tops10 10.3.0.8 ---- d e a d
nsrdcoa 10.3.0.81 -tfs accepted accepted accepted
nswc-dl 10.0.0.84 ---- accepted accepted
nswc-g 10.1.0.84 T--- accepted accepted accepted
nswc-wo 10.2.0.8 ---- accepted accepted accepted
nusc 10.3.0.92 ---- d e a d
nusc-npt 10.2.0.92 ----
nwc-387a 10.0.0.85 ---- d e a d
nwc-387b 10.3.0.85 ---- accepted accepted accepted
nyu 10.0.0.58 ---- accepted accepted accepted
office-1 10.0.0.43 T---
office-10 10.1.0.93 -tf- accepted refused refused
office-12 10.2.0.93 T--- accepted refused refused
office-2 10.1.0.43 T---
office-3 10.2.0.43 T--- accepted refused refused
office-7 10.3.0.43 -t-- accepted refused refused
office-8 10.0.0.93 -t-- accepted refused refused
okc-unix 10.3.0.46 -t-- accepted
parc-maxc 10.0.0.32 -t-- accepted accepted+ accepted
purdue 10.0.0.37 -tfs accepted accepted accepted
purdue-tn 14.0.0.1 -tfs accepted accepted accepted
radc-multics 10.0.0.18 ---- accepted accepted accepted
radc-tops20 10.3.0.18 ---- accepted accepted+ accepted
radc-unix 10.5.0.18 ---- d e a d
radc-xper 10.1.0.18 ----
raisting 4.0.0.72 ----
raisting-expak 4.0.0.79 ----
raisting-monitor 4.0.0.78 ----
rand-relay 10.1.0.7 ---- accepted accepted accepted
rand-unix 10.3.0.7 ---- accepted accepted accepted
robins-unix 10.3.0.64 ---- d e a d
rochester 10.4.0.18 ---- d e a d
rutgers 10.2.0.58 ---- accepted accepted+ accepted
s1-a 10.1.0.95 ----
s1-b 10.2.0.95 ---- d e a d
s1-c 10.3.0.95 ---- accepted accepted refused
s1-gateway 10.0.0.95 ----
sandia 10.0.0.87 ---- accepted accepted+ accepted
satnet 4.0.0.0 ----
satnet-sink 4.0.0.37 ----
seismo 10.0.0.25 -tfs accepted accepted accepted
sri-ai 10.2.0.73 ---- accepted accepted+ accepted
sri-csl 10.2.0.2 ----
sri-iu 10.3.0.73 ---- accepted accepted+ accepted
sri-kl 10.1.0.2 T--- accepted accepted+ accepted
sri-nic 10.0.0.73 -t-- accepted refused accepted
sri-nsc11 10.0.0.2 ----
sri-prmh 10.3.2.51 T---
sri-sta2 10.3.1.51 ----
sri-sta6 10.1.1.51 ----
sri-tsc 10.3.0.2 -tfs accepted accepted+ accepted
sri-unix 10.2.0.51 ---- accepted accepted accepted
sri-warf 10.1.0.73 ----
srijoyce 10.1.4.51 -tf- accepted accepted refused
st-nic 10.0.0.51 -t-- accepted refused refused
su-ai 10.0.0.11 ----
su-dsn 10.1.0.56 ---- refused refused accepted
su-score 10.3.0.11 -t-- accepted accepted accepted
sumex-aim 10.0.0.56 ---- accepted accepted accepted
tanum-expak 4.0.0.3 ----
tanum-monitor 4.0.0.43 ----
tycho 10.0.0.57 ----
ucb-arpa 10.0.0.78 -tf- accepted accepted+ accepted
ucb-c70 10.1.0.78 ---- d e a d
ucb-ingres 10.2.0.78 -tf- accepted accepted+ accepted
ucbarpa 46.0.0.4 -tf- accepted accepted+ accepted
ucbcad 46.0.0.5 -tf-
ucbcalder 46.0.0.12 -tf- accepted accepted accepted
ucbdali 46.0.0.13 -tf-
ucbernie 46.0.0.6 -tf-
ucbesvax 46.0.0.9 -tf-
ucbingres 46.0.0.19 -tf-
ucbkim 46.0.0.11 -tf- accepted accepted accepted
ucbmatisse 46.0.0.14 -tf-
ucbmedea 46.0.0.15 -tf-
ucbmonet 46.0.0.7 -tf- accepted accepted accepted
ucbvax 46.0.0.10 -tf- accepted accepted+ accepted
ucl-cs 11.3.1.42 -t-- accepted
ucl-ucl2 11.3.2.42 ----
ucl-ucl3 11.3.3.42 ----
ucl-ucl4 11.3.4.42 ----
ucl-ucl5 11.3.5.42 ----
ucl-ucl6 11.3.6.42 ----
ucl-ucl7 11.3.7.42 ----
ucla-ats 10.3.0.1 T--- accepted accepted accepted
ucla-ccn 10.1.0.1 T--- accepted
ucla-security 10.2.0.1 T--- accepted accepted accepted
udel-ee 10.2.0.96 -tf- accepted accepted accepted
udel-relay 10.0.0.96 ---- accepted accepted accepted
udel-tcp 10.1.0.96 -tf-
udel-tn 14.0.0.3 -tfs
umd1 128.8.0.1 -tfs accepted accepted+ accepted
umd2 128.8.0.2 -t-- refused refused refused
umd3 128.8.0.3 -tfs accepted accepted+ accepted
umd4 128.8.0.4 -tfs d e a d
umd5 128.8.0.5 -tfs accepted accepted+ accepted
umd6 128.8.0.6 -tfs d e a d
umd7 128.8.0.7 -tfs refused refused refused
usafa-gateway 10.2.0.69 ---- u n r e a c h a b l e
usc-ecl 10.3.0.23 -t-- accepted accepted+ accepted
usc-eclb 10.0.0.23 -t-- accepted accepted+ accepted
usc-eclc 10.1.0.23 -t-- accepted accepted+ accepted
usc-isi 10.1.0.22 -t-s accepted accepted+ accepted
usc-isib 10.3.0.52 -t-s accepted accepted+ accepted
usc-isid 10.0.0.27 -t-s accepted accepted+ accepted
usc-isie 10.1.0.52 -t-s accepted accepted+ accepted
usc-isif 10.2.0.52 -t-s accepted accepted+ accepted
usgs1-amdahl 10.2.0.68 ---- d e a d
usgs1-multics 10.0.0.68 ---- accepted accepted accepted
usgs2-multics 10.0.0.69 ---- accepted accepted accepted
usgs3-multics 10.0.0.70 ---- accepted accepted accepted
utah-20 10.3.0.4 T--- accepted accepted+ accepted
utah-cs 10.0.0.4 -tfs accepted accepted+ accepted
utexas-11 10.0.0.62 ---- accepted accepted accepted
utexas-20 10.1.0.62 ---- accepted accepted+ accepted
uw-vlsi 10.3.0.91 -tf- accepted accepted accepted
uwisc-tn 14.0.0.2 -tfs accepted accepted+ accepted
washington 10.0.0.91 -tfs accepted accepted+ accepted
wharton-10 10.3.0.24 ----
wpafb 10.0.0.47 ---- accepted accepted
wpafb-afwal 10.1.0.47 ---- accepted
yale 10.2.0.9 ---- d e a d
ypg 10.0.0.75 ---- d e a d
Results in host table order:
Name Address Claims Telnet FTP SMTP
---- ------- ------ ------ --- ----
ll 10.0.0.10 ---- accepted accepted accepted
su-ai 10.0.0.11 ----
compion-vms 10.0.0.12 ---s accepted accepted accepted
gunter-unix 10.0.0.13 ----
cmu-cs-b 10.0.0.14 ----
ames-tss 10.0.0.16 ---- accepted accepted accepted
mitre 10.0.0.17 T--- accepted accepted accepted
radc-multics 10.0.0.18 ---- accepted accepted accepted
nbs-vms 10.0.0.19 ---- accepted accepted accepted
sri-nsc11 10.0.0.2 ----
cctc 10.0.0.20 -t-- d e a d
lll-unix 10.0.0.21 ---- d e a d
isi-speech11 10.0.0.22 ----
usc-eclb 10.0.0.23 -t-- accepted accepted+ accepted
nadc-vax 10.0.0.24 -tfs accepted accepted accepted
seismo 10.0.0.25 -tfs accepted accepted accepted
usc-isid 10.0.0.27 -t-s accepted accepted+ accepted
arpa-dms 10.0.0.28 ---- d e a d
brl 10.0.0.29 ---- accepted accepted accepted
nosc-cc 10.0.0.3 -tfs accepted accepted accepted
cca-unix 10.0.0.31 ---- u n r e a c h a b l e
parc-maxc 10.0.0.32 -t-- accepted accepted+ accepted
nps 10.0.0.33 T---
lbl 10.0.0.34 ----
nosc-secure2 10.0.0.35 ----
coins-tas 10.0.0.36 ----
purdue 10.0.0.37 -tfs accepted accepted accepted
utah-cs 10.0.0.4 -tfs accepted accepted+ accepted
office-1 10.0.0.43 T---
mit-xx 10.0.0.44 ---- accepted accepted+ refused
collins-pr 10.0.0.46 T--- d e a d
wpafb 10.0.0.47 ---- accepted accepted
afwl 10.0.0.48 ---- accepted accepted
bbn-tenexb 10.0.0.49 -t-- accepted accepted+ accepted
bbnf 10.0.0.5 -tf- accepted accepted accepted
st-nic 10.0.0.51 -t-- accepted refused refused
ada-vax 10.0.0.52 ---- accepted accepted accepted
afsc-ad 10.0.0.53 T--- accepted accepted
cit-20 10.0.0.54 T--- accepted accepted accepted
anl 10.0.0.55 ----
sumex-aim 10.0.0.56 ---- accepted accepted accepted
tycho 10.0.0.57 ----
nyu 10.0.0.58 ---- accepted accepted accepted
etac 10.0.0.59 ---- d e a d
mit-multics 10.0.0.6 -t-s accepted accepted accepted
centacs-mmp 10.0.0.60 ---- d e a d
utexas-11 10.0.0.62 ---- accepted accepted accepted
afsc-sd 10.0.0.65 ----
mitre-bedford 10.0.0.66 ----
afsc-hq 10.0.0.67 ----
usgs1-multics 10.0.0.68 ---- accepted accepted accepted
usgs2-multics 10.0.0.69 ---- accepted accepted accepted
usgs3-multics 10.0.0.70 ---- accepted accepted accepted
bbn-nu 10.0.0.72 ---s
sri-nic 10.0.0.73 -t-- accepted refused accepted
ypg 10.0.0.75 ---- d e a d
ucb-arpa 10.0.0.78 -tf- accepted accepted+ accepted
dec-2136 10.0.0.79 T--- d e a d
nrl 10.0.0.8 ---- accepted accepted accepted
hi-multics 10.0.0.80 ---- accepted accepted accepted
bbnt 10.0.0.82 ---- accepted accepted accepted
dtnsrdc 10.0.0 .81 ---- accepted accepted accepted
nswc-dl 10.0.0.84 ---- accepted accepted
nwc-387a 10.0.0.85 ---- d e a d
sandia 10.0.0.87 ---- accepted accepted+ accepted
nlm-mcs 10.0.0.88 ---- accepted accepted accepted
harv-10 10.0.0.9 ----
washington 10.0.0.91 -tfs accepted accepted+ accepted
office-8 10.0.0.93 -t-- accepted refused refused
s1-gateway 10.0.0.95 ----
udel-relay 10.0.0.96 ---- accepted accepted accepted
ucla-ccn 10.1.0.1 T--- accepted
ll-tcp 10.1.0.10 T--- accepted accepted accepted
compion 10.1.0.12 ---- accepted refused refused
gunter-adam 10.1.0.13 ---- accepted accepted+ accepted
cmu-cs-a 10.1.0.14 -t-s accepted accepted accepted
radc-xper 10.1.0.18 ----
nbs-sdc 10.1.0.19 ---- accepted accepted+ accepted
sri-kl 10.1.0.2 T--- accepted accepted+ accepted
lll-mfe 10.1.0.21 ----
usc-isi 10.1.0.22 -t-s accepted accepted+ accepted
usc-eclc 10.1.0.23 -t-- accepted accepted+ accepted
isi-png11 10.1.0.27 ----
nosc-spel 10.1.0.3 ---- d e a d
cca-vms 10.1.0.31 T--- u n r e a c h a b l e
fnoc 10.1.0.33 ---- d e a d
lbl-csam 10.1.0.34 ---s accepted accepted+ accepted
nosc-sdl 10.1.0.35 ----
cincpacflt-wm 10.1.0.36 ----
bragg-sta1 10.1.0.38 -t-- d e a d
office-2 10.1.0.43 T---
ll-asg 10.1.0.44 ---- d e a d
collins-gw 10.1.0.46 T---
wpafb-afwal 10.1.0.47 ---- accepted
bbng 10.1.0.5 -tf- accepted accepted accepted
usc-isie 10.1.0.52 -t-s accepted accepted+ accepted
ncsc 10.1.0.53 ---- d e a d
cit-vax 10.1.0.54 -tfs accepted accepted accepted
anl-mcs 10.1.0.55 ---- accepted accepted accepted
su-dsn 10.1.0.56 ---- refused refused accepted
coins-gateway 10.1.0.57 ----
bnl 10.1.0.58 ---- d e a d
mit-dms 10.1.0.6 ---- accepted accepted+
utexas-20 10.1.0.62 ---- accepted accepted+ accepted
martin-b 10.1.0.64 -tfs accepted accepted accepted
afgl 10.1.0.66 ---- accepted accepted
rand-relay 10.1.0.7 ---- accepted accepted accepted
bbn-unix 10.1.0.72 ---- accepted accepted accepted
sri-warf 10.1.0.73 ----
mit-devmultics 10.1.0.77 -t-s accepted accepted accepted
ucb-c70 10.1.0.78 ---- d e a d
dec-marlboro 10.1.0.79 T--- accepted accepted accepted
nrl-aic 10.1.0.8 T--- accepted accepted accepted
nalcon 10.1.0.81 ---- accepted accepted accepted
bbn-vax 10.1.0.82 -tfs accepted accepted accepted
nswc-g 10.1.0.84 T--- accepted accepted accepted
office-10 10.1.0.93 -tf- accepted refused refused
csnet-sh 10.1.0.94 ---- accepted accepted+ accepted
s1-a 10.1.0.95 ----
udel-tcp 10.1.0.96 -tf-
sri-sta6 10.1.1.51 ----
srijoyce 10.1.4.51 -tf- accepted accepted refused
ucla-security 10.2.0.1 T--- accepted accepted accepted
ll-xn 10.2.0.10 ---- d e a d
nbs-unix 10.2.0.19 ---- d e a d
sri-csl 10.2.0.2 ----
nadc 10.2.0.24 ---- u n r e a c h a b l e
isi-vaxa 10.2.0.27 -t-- accepted accepted accepted
logicon 10.2.0.3 ---- d e a d
office-3 10.2.0.43 T--- accepted refused refused
mit-tstgw 10.2.0.44 T--- d e a d
sri-unix 10.2.0.51 ---- accepted accepted accepted
usc-isif 10.2.0.52 -t-s accepted accepted+ accepted
afsc-dev 10.2.0.53 ---- accepted accepted
acc 10.2.0.54 ---- d e a d
rutgers 10.2.0.58 ---- accepted accepted+ accepted
mit-ai 10.2.0.6 ---- accepted accepted+ accepted
aerospace 10.2.0.65 T--- accepted accepted accepted
usgs1-amdahl 10.2.0.68 ---- d e a d
usafa-gateway 10.2.0.69 ---- u n r e a c h a b l e
bbn-clxx 10.2.0.71 -tfs u n r e a c h a b l e
bbnp 10.2.0.72 -tfs accepted accepted accepted
sri-ai 10.2.0.73 ---- accepted accepted+ accepted
ucb-ingres 10.2.0.78 -tf- accepted accepted+ accepted
nswc-wo 10.2.0.8 ---- accepted accepted accepted
bbn-inoc 10.2.0.82 ----
yale 10.2.0.9 ---- d e a d
nusc-npt 10.2.0.92 ----
office-12 10.2.0.93 T--- accepted refused refused
s1-b 10.2.0.95 ---- d e a d
udel-ee 10.2.0.96 -tf- accepted accepted accepted
ucla-ats 10.3.0.1 T--- accepted accepted accepted
ll-11 10.3.0.10 ----
su-score 10.3.0.11 -t-- accepted accepted accepted
cmu-cs-c 10.3.0.14 ---- accepted accepted+ accepted
ames-vmsb 10.3.0.16 ----
radc-tops20 10.3.0.18 ---- accepted accepted+ accepted
nbs-pl 10.3.0.19 ----
sri-tsc 10.3.0.2 -tfs accepted accepted+ accepted
edn-unix 10.3.0.20 -tfs accepted accepted
usc-ecl 10.3.0.23 -t-- accepted accepted+ accepted
wharton-10 10.3.0.24 ----
arpa-png11 10.3.0.28 ----
brl-bmd 10.3.0 .29 ---- accepted accepted refused
nprdc 10.3.0.3 -tfs accepted accepted accepted
kestrel 10.3.0.32 ----
fnoc-secure 10.3.0.33 ----
nosc-secure3 10.3.0.35 ---- d e a d
utah-20 10.3.0.4 T--- accepted accepted+ accepted
office-7 10.3.0.43 -t-- accepted refused refused
mit-mc 10.3.0.44 ---- accepted accepted+ accepted
okc-unix 10.3.0.46 -t-- accepted
bbn-tenexc 10.3.0.49 -t-- accepted refused accepted
bbna 10.3.0.5 -tf- accepted accepted accepted
sri-sta2 10.3.1.51 ----
sri-prmh 10.3.2.51 T---
usc-isib 10.3.0.52 -t-s accepted accepted+ accepted
martin 10.3.0.53 ----
jpl-vax 10.3.0.54 ---- d e a d
aids-unix 10.3.0.56 ---- u n r e a c h a b l e
mit-ml 10.3.0.6 ---- accepted accepted+ accepted
centacs-tf 10.3.0.60 ---- d e a d
robins-unix 10.3.0.64 ---- d e a d
rand-unix 10.3.0.7 ---- accepted accepted accepted
sri-iu 10.3.0.73 ---- accepted accepted+ accepted
mcclellan 10.3.0.78 ---- accepted
nrl-tops10 10.3.0.8 ---- d e a d
nsrdcoa 10.3.0.81 -tfs accepted accepted accepted
bbns 10.3.0.82 -tfs accepted accepted accepted
nwc-387b 10.3.0.85 ---- accepted accepted accepted
uw-vlsi 10.3.0.91 -tf- accepted accepted accepted
nusc 10.3.0.92 ---- d e a d
s1-c 10.3.0.95 ---- accepted accepted refused
cornell 10.3.0.96 -tfs accepted accepted accepted
ll-iptcp 10.3.44.10 T---
ll-en 10.4.0.10 -tfs accepted accepted accepted
rochester 10.4.0.18 ---- d e a d
dca-ems 10.4.0.20 ---- accepted accepted accepted
bbn-rsm 10.4.0.82 -t-- accepted
radc-unix 10.5.0.18 ---- d e a d
bbn-noc2 10.6.0.82 -tfs accepted accepted accepted
nrl-css 10.7.0.8 ---- accepted accepted accepted
ucl-cs 11.3.1.42 -t-- accepted
ucl-ucl2 11.3.2.42 ----
ucl-ucl3 11.3.3.42 ----
ucl-ucl4 11.3.4.42 ----
ucl-ucl5 11.3.5.42 ----
ucl-ucl6 11.3.6.42 ----
ucl-ucl7 11.3.7.42 ----
csnet-purdue 128.10.0.2 -tfs accepted accepted accepted
cmu-cs-ius 128.2.254.128 -tfs accepted accepted accepted
cmu-cs-vlsi 128.2.254.129 -tfs accepted accepted accepted
cmu-cs-ps 128.2.254.130 ---- d e a d
cmu-cs-zog 128.2.254.131 -tfs accepted accepted accepted
cmu-cs-g 128.2.254.132 -tfs accepted accepted accepted
cmu-cs-cad 128.2.254.133 -tfs accepted accepted accepted
cmu-cs-k 128.2.254.136 -tfs d e a d
cmu-ri-fas 128.2.254.138 -tfs accepted accepted accepted
cmu-cs-spice 128.2.254.139 -tfs accepted accepted accepted
cmu-cs-gandalf 128.2.254.140 -tfs accepted accepted accepted
cmu-ri-leg 128.2.254.141 -tfs d e a d
cmu-ri-isl 128.2.254.143 -tfs accepted accepted accepted
cmu-cs-j 128.2.254.144 -tfs d e a d
cmu-cs-speech 128.2.254.145 -tfs accepted accepted accepted
cmu-cs-unh 128.2.254.150 -tfs accepted accepted accepted
cmu-ri-isl2 128.2.254.152 -tfs accepted accepted accepted
cmu-cs-pt 128.2.254.155 -tfs accepted accepted accepted
cmu 128.2.254.255 ---s d e a d
dcn1 128.4.0.1 -tfs ted accepted+ accepted
dcn2 128.4.0.2 -tfs accepted accepted+ accepted
dcn3 128.4.0.3 -tfs accepted accepted+ accepted
dcn4 128.4.0.4 -tfs d e a d
dcn5 128.4.0.5 -tfs accepted accepted+ accepted
dcn6 128.4.0.6 -tfs accepted accepted+ accepted
dcn7 128.4.0.7 -tfs d e a d
dcn8 128.4.0.8 -tfs d e a d
dcn9 128.4.0.9 -tfs d e a d
ford1 128.5.0.1 -tfs accepted accepted+ accepted
ford2 128.5.0.2 -tfs accepted accepted+ accepted
ford3 128.5.0.3 -tfs accepted accepted+ accepted
ford4 128.5.0.4 -tfs accepted accepted+ accepted
ford-lab 128.5.0.8 -tfs accepted accepted+ accepted
ford-vax 128.5.0.9 -tfs d e a d
ford-res 128.5.0.10 -tfs d e a d
ford-ecc 128.5.0.11 -tfs accepted accepted+ accepted
ford-srl 128.5.0.12 -tfs d e a d
ford-ers 128.5.0.13 -tfs accepted accepted+ accepted
ford-eed 128.5.0.14 -tfs accepted accepted+ accepted
ford-foe 128.5.0.15 -tfs d e a d
ford-wdl1 128.5.32.1 -tfs accepted accepted accepted
ford-wdl2 128.5.32.2 -tfs d e a d
ford-wdl3 128.5.32.3 -tfs d e a d
ford-wdl4 128.5.32.4 -tfs d e a d
ford-wdl5 128.5.32.5 -tfs d e a d
ford-wdl6 128.5.32.6 -t-- accepted accepted accepted
dfvlr1 128.7.0.1 -tfs u n r e a c h a b l e
dfvlr2 128.7.0.2 -tfs u n r e a c h a b l e
dfvlr3 128.7.0.3 -tfs u n r e a c h a b l e
dfvlr7 128.7.0.7 -tfs u n r e a c h a b l e
umd1 128.8.0.1 -tfs accepted accepted+ accepted
umd2 128.8.0.2 -t-- refused refused refused
umd3 128.8.0.3 -tfs accepted accepted+ accepted
umd4 128.8.0.4 -tfs d e a d
umd5 128.8.0.5 -tfs accepted accepted+ accepted
umd6 128.8.0.6 -tfs d e a d
umd7 128.8.0.7 -tfs refused refused refused
purdue-tn 14.0.0.1 -tfs accepted accepted accepted
uwisc-tn 14.0.0.2 -tfs accepted accepted+ accepted
udel-tn 14.0.0.3 -tfs
mit-csr 18.10.0.8 ---s accepted accepted
mit-ajax 18.10.0.64 -tf- accepted accepted accepted
mit-cls 18.10.0.76 -tfs accepted accepted accepted
csnet-sh 192.5.2.3 T--- accepted accepted+ accepted
cit-750 192.5.7.3 -tfs u n r e a c h a b l e
edn-host1 21.1.0.1 -tfs d e a d
bbncca 3.0.0.2 -tfs accepted accepted accepted
bbnccf 3.0.0.4 -tfs accepted accepted accepted
bbnx 3.0.0.8 -tfs accepted accepted accepted
csnet-cic 3.0.0.14 -tfs accepted accepted accepted
bbn-noc 3.1.0.14 -tfs accepted accepted accepted
bbnccb 3.1.0.2 -tfs accepted accepted accepted
bbn-unix 3.1.0.4 -tfs accepted accepted accepted
alta-coma 3.1.0.50 T---
bbn-admin 3.1.0.6 -tfs accepted accepted accepted
bbnt 3.1.0.7 -tfs accepted accepted accepted
bbnccc 3.2.0.2 -tfs accepted accepted accepted
bbn-inoc 3.2.0.6 -tfs accepted accepted accepted
bbnq 3.2.0.7 -tfs accepted accepted accepted
bbny 3.2.0.8 -tfs accepted accepted accepted
bbnccd 3.3.0.2 -tfs accepted accepted accepted
bbncci 3.3.0.4 -tfs accepted accepted accepted
bbnw 3.3.0.6 -tfs accepted accepted accepted
bbnt 3.3.0.7 -tfs accepted accepted accepted
bbn-cd 3.3.0.9 -tfs accepted accepted accepted
satnet 4.0.0.0 ----
etam-expak 4.0.0.1 ----
goonhilly-expak 4.0.0.2 ----
tanum-expak 4.0.0.3 ----
satnet-sink 4.0.0.37 ----
etam-monitor 4.0.0.41 ----
goonhilly-monitor 4.0.0.42 ----
tanum-monitor 4.0.0.43 ----
raisting 4.0.0.72 ----
raisting-monitor 4.0.0.78 ----
raisting-expak 4.0.0.79 ----
fucino 4.0.0.88 ----
fucino-monitor 4.0.0.94 ----
fucino-expak 4.0.0.95 ----
ucbarpa 46.0.0.4 -tf- accepted accepted+ accepted
ucbcad 46.0.0.5 -tf-
ucbernie 46.0.0.6 -tf-
ucbmonet 46.0.0.7 -tf- accepted accepted accepted
ucbesvax 46.0.0.9 -tf-
ucbvax 46.0.0.10 -tf- accepted accepted+ accepted
ucbkim 46.0.0.11 -tf- accepted accepted accepted
ucbcalder 46.0.0.12 -tf- accepted accepted accepted
ucbdali 46.0.0.13 -tf-
ucbmatisse 46.0.0.14 -tf-
ucbmedea 46.0.0.15 -tf-
ucbingres 46.0.0.19 -tf-
ndre1 48.3.1.41 -tfs accepted accepted+ accepted
clarksburg-expak 8.0.0.4 ----
clarksburg-monitor 8.0.0.44 ---- d e a d
AI ELI5
On this page
PROBLEMAs the internet was rapidly changing, a single survey snapshot was already becoming outdated within weeks.
MECHANISMSmallberg repeated the TCP connectivity test just one week after RFC 838, testing the same 323 hosts for Telnet, FTP, and SMTP support to measure how the network was evolving.
TRACKING RAPID CHANGEThe new results show changes in TCP adoption: 182 hosts now accepted Telnet (up from 172), 165 accepted FTP (up from 159), and 159 accepted SMTP (up from 154). Some previously dead hosts were now reachable, indicating rapid infrastructure changes.
§1The Updated Survey
RFC 839 is the second in David Smallberg's series of TCP deployment surveys. Just one week after RFC 838, Smallberg ran the same test again on the same 323 hosts, testing from 25 January to 26 January 1983. This rapid re-testing provides valuable evidence of how quickly the Internet was changing and evolving during this early period.
By re-testing the same hosts only a week later, Smallberg captures a network in transition, with changes happening almost daily as more systems came online and previously offline machines were brought back up.
One week after the first test, the tester knocked on the same doors again to see if anything had changed.
§2Test Methodology
The testing procedure was identical to RFC 838. Smallberg used the same test host list from the NIC hostname table and tested for the same three services: Telnet, FTP, and SMTP. Like the previous survey, hosts that did not respond on the first attempt were retried the following day.
By using the same methodology, RFC 839 allows direct comparison with RFC 838, making it possible to track which specific hosts changed status and to measure the overall rate of TCP adoption across the network.
He used the same test method as before, knocking on the same doors the same way.
§3Updated Results
In one week, the results improved measurably. 182 hosts now accepted Telnet (compared to 172 the previous week), 165 accepted FTP (up from 159), and 159 accepted SMTP (up from 154). While 53 hosts were still dead (down from 66), the reliability of previously unreachable hosts also changed.
These week-to-week improvements suggest that the TCP infrastructure was maturing rapidly. Some hosts that had been down came back online, while others may have added TCP support. The data captures a moment when network infrastructure was growing faster than administrators could keep the central hostname table updated.
More computers were now answering the knock. Telnet went from 172 to 182, FTP from 159 to 165, and SMTP from 154 to 159. That's progress in just one week.
| Service | RFC 838 (Jan 18) | RFC 839 (Jan 25) |
|---|---|---|
| Telnet accepted | 104 | 110 |
| FTP accepted | 82 | 84 |
| SMTP accepted | 78 | 82 |
§4Week-to-Week Changes
The ability to compare RFC 838 and RFC 839 reveals important trends. Telnet adoption jumped by 10 hosts, FTP by 6, and SMTP by 5 in just one week. The total number of dead hosts fell from 66 to 53, suggesting that maintenance and upgrades were happening across the network.
However, the hostnames table claims also shifted, showing inconsistency in how administrators updated their metadata. This survey series demonstrates why a centralized way to discover and verify network services would eventually become important.
Comparing the two weeks side by side shows that the network was fixing itself and growing. Dead computers came back to life, and more computers learned TCP.