RFC 836 UNKNOWN TRANSPORT · SURVEY · TCP
Who talks TCP?
January 1983 snapshot of TCP service adoption across early Internet hosts.
RFC EDITOR
Smallberg, D., "Who talks TCP?", RFC 836, DOI 10.17487/RFC0836, January 1983, <https://www.rfc-editor.org/info/rfc836>.
BIBTEX
@misc{rfc836,
series = {Request for Comments},
number = 836,
howpublished = {RFC 836},
publisher = {RFC Editor},
doi = {10.17487/RFC0836},
url = {https://www.rfc-editor.org/info/rfc836},
author = {D. Smallberg},
title = {{Who talks TCP?}},
pagetotal = 13,
year = 1983,
month = jan,
} LINEAGE · FROM THE RFC INDEXOpen full graph →
RFC text
Network Working Group D. Smallberg
Request for Comments: 836 January 1983
Who Talks TCP?
The list of hosts was taken from the NIC hostname table of 20-Dec-82.
The tests were run on 4-Jan-83 from ~12:01 pm to ~1:10 am PST Jan. 5.
Dead, refused, and unreachable hosts were retried 5-Jan-83 from ~8:00 am
to ~4:15 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 | 13 | 6 | 4 | 23 | 91 | 137
l +-----------+-------------+---------+------+------------+
a tcp | 8 | 0 | 0 | 3 | 15 | 26
i +-----------+-------------+---------+------+------------+
m Nothing | 64 | 3 | 3 | 37 | 45 | 152
+-----------+-------------+---------+------+------------+----
85 9 7 63 151 | 315
FTP Result
accepted or
no tcp/ftp unreachable refused dead accepted+
+-----------+-------------+---------+------+------------+
C tcp/ftp | 13 | 5 | 4 | 21 | 70 | 113
l +-----------+-------------+---------+------+------------+
a tcp | 9 | 0 | 3 | 3 | 11 | 26
i +-----------+-------------+---------+------+------------+
m Nothing | 72 | 4 | 10 | 39 | 51 | 176
+-----------+-------------+---------+------+------------+----
94 9 17 63 132 | 315
SMTP Result
no tcp/smtp unreachable refused dead accepted
+-----------+-------------+---------+------+------------+
C tcp/smtp | 4 | 6 | 0 | 21 | 72 | 103
l +-----------+-------------+---------+------+------------+
a tcp | 10 | 0 | 4 | 3 | 9 | 26
i +-----------+-------------+---------+------+------------+
m Nothing | 82 | 3 | 19 | 39 | 43 | 186
+-----------+-------------+---------+------+------------+----
96 9 23 63 124 | 315
Results in alphabetical order:
Name Address Claims Telnet FTP SMTP
---- ------- ------ ------ --- ----
acc 10.2.0.54 ----
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 ---- d e a d
alta-coma 3.1.0.50 T---
ames-11 10.3.0.16 ----
ames-67 10.0.0.16 T--- d e a d
anl 10.0.0.55 ---- d e a d
anl-mcs 10.1.0.55 ---- d e a d
arpa-dms 10.0.0.28 ----
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 accepted accepted accepted
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-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
bbnb 10.0.0.49 -t-- accepted refused refused
bbnc 10.3.0.49 -t-- d e a d
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 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 ----
bragg-sta1 10.1.0.38 -t--
brl 10.0.0.29 ---- d e a d
brl-bmd 10.3.0.29 ---- accepted refused refused
cca-unix 10.0.0.31 ---- refused accepted refused
cca-vms 10.1.0.31 T--- d e a d
cctc 10.0.0.20 -t--
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-vax 10.1.0.54 T--- accepted accepted accepted
clarksburg-expak 8.0.0.4 ---- u n r e a c h a b l e
clarksburg-monitor 8.0.0.44 ---- u n r e a c h a b l e
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 ---- d e a d
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 refused 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---
compion 10.1.0.12 ---- refused 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 10.2.0.37 -tfs u n r e a c h a b l e
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 d e a d
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---
dec-marlboro 10.1.0.79 T--- accepted refused refused
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 10.1.0.81 ---- accepted accepted accepted
edn-host1 21.1.0.1 -tfs accepted
edn-unix 10.3.0.20 -tfs accepted
etac 10.0.0.59 ----
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 d e a d
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 ----
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-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 ---- d e a d
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 10.3.0.31 -t-s u n r e a c h a b l e
mit-dms 10.1.0.6 ---- accepted refused refused
mit-mc 10.3.0.44 ---- accepted accepted+ accepted
mit-ml 10.3.0.6 ----
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 ---- d e a d
nadc-vax 10.0.0.24 T--- accepted accepted accepted
nalcon 10.0.0.81 ---- accepted accepted accepted
nbs-pl 10.3.0.19 ---- d e a d
nbs-sdc 10.1.0.19 ---- d e a d
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
nems 10.3.0.81 -tfs accepted accepted accepted
nlm-mcs 10.0.0.88 ---- accepted accepted accepted
nosc-cc 10.0.0.3 ---- 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 ----
nswc-dl 10.0.0.84 ---- accepted accepted
nswc-wo 10.2.0.8 ---- d e a d
nusc 10.3.0.92 ----
nusc-npt 10.2.0.92 ----
nwc-387a 10.0.0.85 ---- accepted accepted accepted
nwc-387b 10.3.0.85 ---- accepted accepted accepted
nyu 10.0.0.58 ----
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-- refused refused refused
office-8 10.0.0.93 ---- accepted refused refused
okc-unix 10.3.0.46 ----
parc-maxc 10.0.0.32 ---- accepted accepted refused
purdue 128.10.0.1 -tfs accepted accepted accepted
purdue-tn 14.0.0.1 -tfs accepted accepted accepted
radc-multics 10.0.0.18 ----
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 ---- d e a d
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 refused
rand-unix 10.3.0.7 ---- accepted accepted accepted
robins-unix 10.3.0.64 ---- d e a d
rochester 10.4.0.18 ----
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 accepted
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 ----
sri-csl 10.2.0.2 ----
sri-iu 10.3.0.73 ---- accepted accepted+ accepted
sri-kl 10.1.0.2 ---- accepted accepted+ accepted
sri-nic 10.0.0.73 -t-- accepted refused refused
sri-nsc11 10.0.0.2 ---- d e a d
sri-prmh 10.3.2.51 T--- accepted accepted refused
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 refused
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-- d e a d
sumex-aim 10.0.0.56 ---- d e a d
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 ----
ucb-ingres 10.2.0.78 -tf- refused refused accepted
ucbarpa 46.0.0.4 -tf- accepted accepted accepted
ucbcad 46.0.0.5 -tf-
ucbcalder 46.0.0.12 -tf-
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-
ucbvax 46.0.0.10 -tf- refused refused accepted
ucl-cs 11.3.1.42 -t-- accepted refused
ucl-ucl2 11.3.2.42 ---- accepted refused
ucl-ucl3 11.3.3.42 ---- d e a d
ucl-ucl4 11.3.4.42 ---- d e a d
ucl-ucl5 11.3.5.42 ----
ucl-ucl6 11.3.6.42 ---- d e a d
ucl-ucl7 11.3.7.42 ---- d e a d
ucla-ats 10.0.0.1 ---- d e a d
ucla-ccn 10.1.0.1 T--- accepted
ucla-locus 10.3.0.1 ---- accepted accepted accepted
ucla-security 10.2.0.1 ---- 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 d e a d
usafa-gateway 10.2.0.69 ---- d e a d
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 ----
usgs1-multics 10.0.0.68 ----
usgs2-multics 10.0.0.69 ----
usgs3-multics 10.0.0.70 ----
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 refused
utexas-20 10.1.0.62 ---- accepted accepted+ accepted
uw-vlsi 10.3.0.91 -tf- d e a d
uwisc-tn 14.0.0.2 -tfs accepted accepted+ accepted
washington 10.0.0.91 ---- 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 ---- u n r e a c h a b l e
Results in host table order:
Name Address Claims Telnet FTP SMTP
---- ------- ------ ------ --- ----
ucla-ats 10.0.0.1 ---- d e a d
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-67 10.0.0.16 T--- d e a d
mitre 10.0.0.17 T--- accepted accepted accepted
radc-multics 10.0.0.18 ----
nbs-vms 10.0.0.19 ---- accepted accepted accepted
sri-nsc11 10.0.0.2 ---- d e a d
cctc 10.0.0.20 -t--
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 T--- 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 ----
brl 10.0.0.29 ---- d e a d
nosc-cc 10.0.0.3 ---- accepted accepted accepted
cca-unix 10.0.0.31 ---- refused accepted refused
parc-maxc 10.0.0.32 ---- accepted accepted refused
nps 10.0.0.33 T---
lbl 10.0.0.34 ----
nosc-secure2 10.0.0.35 ----
coins-tas 10.0.0.36 ----
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---
wpafb 10.0.0.47 ---- accepted accepted
afwl 10.0.0.48 ---- d e a d
bbnb 10.0.0.49 -t-- accepted refused refused
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 ---- d e a d
sumex-aim 10.0.0.56 ---- d e a d
tycho 10.0.0.57 ----
nyu 10.0.0.58 ----
etac 10.0.0.59 ----
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 refused
afsc-sd 10.0.0.65 ----
mitre-bedford 10.0.0.66 ----
afsc-hq 10.0.0.67 ----
usgs1-multics 10.0.0.68 ----
usgs2-multics 10.0.0.69 ----
usgs3-multics 10.0.0.70 ----
bbn-nu 10.0.0.72 ---s
sri-nic 10.0.0.73 -t-- accepted refused refused
ypg 10.0.0.75 ---- u n r e a c h a b l e
ucb-arpa 10.0.0.78 -tf- accepted accepted accepted
dec-2136 10.0.0.79 T---
nrl 10.0.0.8 ---- accepted accepted accepted
hi-multics 10.0.0.80 ----
nalcon 10.0.0.81 ---- accepted accepted accepted
nswc-dl 10.0.0.84 ---- accepted accepted
nwc-387a 10.0.0.85 ---- accepted accepted accepted
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 ---- accepted accepted+ accepted
office-8 10.0.0.93 ---- 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 ---- refused 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 ---- d e a d
nbs-sdc 10.1.0.19 ---- d e a d
sri-kl 10.1.0.2 ---- accepted accepted+ accepted
lll-mfe 10.1.0.21 ---- d e a d
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--- d e a d
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--
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 T--- accepted accepted accepted
anl-mcs 10.1.0.55 ---- d e a d
su-dsn 10.1.0.56 ---- refused refused accepted
coins-gateway 10.1.0.57 ----
bnl 10.1.0.58 ----
mit-dms 10.1.0.6 ---- accepted refused refused
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 refused
sri-warf 10.1.0.73 ----
ucb-c70 10.1.0.78 ----
dec-marlboro 10.1.0.79 T--- accepted refused refused
nrl-aic 10.1.0.8 T--- accepted accepted accepted
dtnsrdc 10.1.0.81 ---- accepted accepted accepted
bbn-vax 10.1.0.82 -tfs accepted accepted accepted
office-10 10.1.0.93 -tf- accepted refused refused
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 ---- 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 ---- d e a d
isi-vaxa 10.2.0.27 -t-- accepted accepted accepted
logicon 10.2.0.3 ---- d e a d
csnet-purdue 10.2.0.37 -tfs u n r e a c h a b l e
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 refused
usc-isif 10.2.0.52 -t-s accepted accepted+ accepted
afsc-dev 10.2.0.53 ---- accepted accepted
acc 10.2.0.54 ----
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 ----
usafa-gateway 10.2.0.69 ---- d e a d
bbn-clxx 10.2.0.71 -tfs accepted accepted accepted
bbnp 10.2.0.72 -tfs accepted accepted accepted
sri-ai 10.2.0.73 ----
ucb-ingres 10.2.0.78 -tf- refused refused accepted
nswc-wo 10.2.0.8 ---- d e a d
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-locus 10.3.0.1 ---- accepted accepted accepted
ll-11 10.3.0.10 ----
su-score 10.3.0.11 -t-- d e a d
cmu-cs-c 10.3.0.14 ---- d e a d
ames-11 10.3.0.16 ----
radc-tops20 10.3.0.18 ---- accepted accepted+ accepted
nbs-pl 10.3.0.19 ---- d e a d
sri-tsc 10.3.0.2 -tfs accepted accepted+ accepted
edn-unix 10.3.0.20 -tfs 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 refused refused
nprdc 10.3.0.3 -tfs accepted accepted accepted
mit-devmultics 10.3.0.31 -t-s u n r e a c h a b l e
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-- refused refused refused
mit-mc 10.3.0.44 ---- accepted accepted+ accepted
okc-unix 10.3.0.46 ----
bbnc 10.3.0.49 -t-- d e a d
bbna 10.3.0.5 -tf- accepted accepted accepted
sri-sta2 10.3.1.51 ----
sri-prmh 10.3.2.51 T--- accepted accepted refused
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
mit-ml 10.3.0.6 ----
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 ----
nems 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- d e a d
nusc 10.3.0.92 ----
s1-c 10.3.0.95 ---- accepted accepted accepted
cornell 10.3.0.96 -tfs accepted accepted accepted
ll-iptcp 10.3.44.10 T---
rochester 10.4.0.18 ----
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 refused
ucl-ucl2 11.3.2.42 ---- accepted refused
ucl-ucl3 11.3.3.42 ---- d e a d
ucl-ucl4 11.3.4.42 ---- d e a d
ucl-ucl5 11.3.5.42 ----
ucl-ucl6 11.3.6.42 ---- d e a d
ucl-ucl7 11.3.7.42 ---- d e a d
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 refused accepted
cmu-cs-pt 128.2.254.155 -tfs accepted accepted accepted
cmu 128.2.254.255 ---s d e a d
purdue 128.10.0.1 -tfs accepted accepted accepted
dcn1 128.4.0.1 -tfs accepted accepted+ accepted
dcn2 128.4.0.2 -tfs d e a d
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 d e a d
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
fdl4 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 d e a d
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
edn-host1 21.1.0.1 -tfs accepted
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
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-
ucbesvax 46.0.0.9 -tf-
ucbvax 46.0.0.10 -tf- refused refused accepted
ucbkim 46.0.0.11 -tf- accepted accepted accepted
ucbcalder 46.0.0.12 -tf-
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 ---- u n r e a c h a b l e
clarksburg-monitor 8.0.0.44 ---- u n r e a c h a b l e
AI ELI5
On this page
PROBLEMTCP adoption across the Internet was still unevenly distributed, and no recent data existed on which hosts could accept connections.
MECHANISMDavid Smallberg ran the same survey as RFC 835 in early January 1983, testing connectivity to Telnet, FTP, and SMTP across 315 hosts from the NIC hostname table.
WHY IT MATTERSThe survey showed increased adoption: 91 hosts now accepted Telnet, 70 accepted FTP, and 72 accepted SMTP, demonstrating steady growth over the month since the previous survey. This edition was replaced by RFC 837 with data from mid-January.
§1An Updated Survey of TCP Services
RFC 836 is an updated survey by David Smallberg, repeating the methodology of RFC 835 but with data from January 1983. The survey tested 315 hosts for their ability to accept Telnet, FTP, and SMTP connections via TCP.
The tests ran from January 4 to 5, 1983, with failed and problematic hosts retried on January 5. This survey used the NIC hostname table dated December 20, 1982, as its host list.
A month later, the same researcher knocked on the same computers to see the current state of TCP adoption.
§2Survey Methodology and Classification
The survey uses the same methodology as RFC 835: hosts are classified by their claimed capabilities in the hostname table, then tested to see whether they accept connections. Results are recorded as accepted, refused, unreachable, dead, or no service offered.
The RFC presents summary tables showing the counts of each result type for each service, followed by detailed alphabetical and host-table-order listings of every host and its specific results.
Same method as before: check the claims, try to connect, and record what happens.
§3Growth in TCP Adoption
Adoption grew significantly month-to-month: 91 hosts now accepted Telnet (up from 61 in December), 70 accepted FTP (up from 43), and 72 accepted SMTP (up from 44). The total number of hosts claiming TCP capabilities also grew, from 314 to 315 hosts surveyed. Notably, more hosts claiming services now actually delivered them, suggesting either deployment had accelerated or the previous survey under-reported working services.
Unreachability and dead hosts remained a significant factor: many systems were still not connected or were offline during testing.
About 50 percent more hosts answered for Telnet and email this month. This shows TCP was spreading quickly across the network.
§4Comparative Analysis from Monthly Data
Comparing RFC 836 to RFC 835 shows clear deployment momentum: Telnet support increased 49 percent (61 to 91 hosts), FTP increased 63 percent (43 to 70), and SMTP increased 64 percent (44 to 72). The growth was not uniform across the network; some major computing centers remained unreachable, while others had come online or activated services.
The data demonstrates that TCP service deployment was accelerating in the early months of 1983, driven by increasing Internet connectivity and broader adoption of TCP-based protocols. Major research centers and computing facilities were moving toward offering these services as standard capabilities.
Every service was growing at the same fast rate, meaning the whole network was adopting TCP together. It was like a wave spreading across the system.