Ports 0 through 99
Port |
Protocol |
Name |
Description |
0 |
None |
None |
Port 0 is marked "reserved" by IANA. On most (all?) operating systems, trying to bind to port 0 will actually bind to a random ephemeral port. Port 0 should not be seen in normal traffic. |
1 |
TCP |
tcpmux |
TCP Port Service Multiplexer (RFC 1078). |
2 |
TCP, UDP |
compressnet |
Management Utility |
3 |
TCP, UDP |
compressnet |
Compression Process |
4 |
|
Unassigned |
|
5 |
TCP, UDP |
rje |
Remote Job Entry |
6 |
|
Unassigned |
Unassigned |
7 |
TCP, UDP |
echo |
|
8 |
|
Unassigned |
Unassigned |
9 |
TCP, UDP |
discard, sink, null |
|
10 |
|
Unassigned |
Unassigned |
11 |
TCP, UDP |
systat, users |
|
12 |
|
Unassigned |
Unassigned |
13 |
TCP, UDP |
daytime |
DaytimeProtocol (RFC 867) (This is not the same thing as NetworkTimeProtocol) |
14 |
|
Unassigned |
Unassigned |
15 |
|
Unassigned |
Was netstat |
16 |
|
Unassigned |
Unassigned |
17 |
TCP, UDP |
qotd, quote |
|
18 |
TCP, UDP |
msp |
|
19 |
TCP, UDP |
chargen, ttytst, source |
|
20 |
TCP |
ftp-data |
Default FTP data port |
21 |
TCP |
ftp |
|
22 |
TCP |
ssh |
|
23 |
TCP |
telnet |
|
24 |
TCP, UDP |
Reserved |
Any private mail system |
25 |
TCP |
smtp |
|
26 |
|
Unassigned |
Unassigned |
27 |
TCP, UDP |
nsw-fe |
NSW User System FE |
28 |
|
Unassigned |
Unassigned |
29 |
TCP, UDP |
msg-icp |
MSG ICP |
30 |
|
Unassigned |
Unassigned |
31 |
TCP, UDP |
msg-auth |
MSG Authentication |
32 |
|
Unassigned |
Unassigned |
33 |
TCP, UDP |
dsp |
Display Support Protocol |
34 |
|
Unassigned |
Unassigned |
35 |
TCP, UDP |
Reserved |
Any private printer server |
36 |
|
Unassigned |
Unassigned |
37 |
TCP, UDP |
time, timeserver |
TimeProtocol (RFC 868) (This is not the same thing as NetworkTimeProtocol) |
38 |
TCP, UDP |
rap |
|
39 |
UDP |
rlp |
|
40 |
|
Unassigned |
Unassigned |
41 |
TCP, UDP |
grapics |
Graphics |
42 |
UDP |
nameserver |
Internet Name Server (IEN 116) |
43 |
TCP |
whois, nicname |
|
44 |
TCP, UDP |
mpm-flags |
MPM FLAGS Protocol |
45 |
TCP, UDP |
mpm |
Message Processing Module [recv] |
46 |
TCP, UDP |
mpm-snd |
MPM [default send] |
47 |
TCP, UDP |
ni-ftp |
NI FTP |
48 |
TCP, UDP |
auditd |
Digital Audit Daemon |
49 |
TCP, UDP |
tacacs |
|
50 |
TCP, UDP |
re-mail-ck |
Remote Mail Checking Protocol (RFC 1339) |
51 |
TCP, UDP |
la-maint |
IMP Logical Address Maintenance |
52 |
TCP, UDP |
xns-time |
XNS Time Protocol |
53 |
TCP, UDP |
domain, nameserver |
|
54 |
TCP, UDP |
xns-ch |
XNS Clearinghouse |
55 |
TCP, UDP |
isi-gl |
ISI Graphics Language |
56 |
TCP, UDP |
xns-auth |
XNS Authentication |
57 |
TCP, UDP |
Reserved |
Any private terminal access |
58 |
TCP, UDP |
xns-mail |
XNS Mail |
59 |
TCP, UDP |
Reserved |
Any private file service |
60 |
|
Unassigned |
Unassigned |
61 |
TCP, UDP |
ni-mail |
NI MAIL |
62 |
TCP, UDP |
acas |
ACA Services http://h18000.www1.hp.com/info/SP4708/SP4708PF.PDF |
63 |
TCP, UDP |
whois++ |
WHOIS++ (RFC 1835) |
64 |
TCP, UDP |
covia |
Communications Integrator |
65 |
TCP, UDP |
tacacs-ds |
TACACS Database Service |
66 |
TCP, UDP |
sql*net |
Oracle SQL*Net |
67 |
TCP, UDP |
bootps |
BootstrapProtocol Server (often used by DHCP) |
68 |
TCP, UDP |
bootpc |
BootstrapProtocol Client (often used by DHCP) |
69 |
TCP, UDP |
tftp |
|
70 |
TCP, UDP |
gopher |
|
71 |
TCP, UDP |
netrjs-1 |
Remote Job Service |
72 |
TCP, UDP |
netrjs-2 |
Remote Job Service |
73 |
TCP, UDP |
netrjs-3 |
Remote Job Service |
74 |
TCP, UDP |
netrjs-4 |
Remote Job Service |
75 |
TCP, UDP |
Reserved |
Any private dial out service |
76 |
TCP, UDP |
deos |
Distributed External Object Store |
77 |
TCP, UDP |
Reserved |
Any private RJE service |
78 |
TCP, UDP |
vettcp |
vettcp |
79 |
TCP, UDP |
finger |
|
80 |
TCP, UDP |
www, http |
|
81 |
TCP, UDP |
hosts2-ns |
HOSTS2 Name Server |
82 |
TCP, UDP |
xfer |
XFER Utility |
83 |
TCP, UDP |
mit-ml-dev |
MIT ML Device |
84 |
TCP, UDP |
ctf |
Common Trace Facility |
85 |
TCP, UDP |
mit-ml-dev |
MIT ML Device |
86 |
TCP, UDP |
mfcobol |
Micro Focus Cobol |
87 |
TCP, UDP |
Reserved |
Any private terminal link |
88 |
TCP, UDP |
kerberos, kerberos5, krb5 |
KerberosProtocol (RFC 1510 plus many drafts) |
89 |
TCP, UDP |
su-mit-tg |
SU/MIT Telnet Gateway |
90 |
TCP, UDP |
dnsix |
DNSIX Security Attribute Token Map |
91 |
TCP, UDP |
mit-dov |
MIT Dover Spooler |
92 |
TCP, UDP |
npp |
Network Printing Protocol (RFC 1486?) |
93 |
TCP, UDP |
dcp |
Device Control Protocol |
94 |
TCP, UDP |
objcall |
Tivoli Object Dispatcher |
95 |
TCP, UDP |
supdup |
SUPDUP |
96 |
TCP, UDP |
dixie |
DIXIE Protocol Specification |
97 |
TCP, UDP |
swift-rvf |
Swift Remote Virtural File Protocol |
98 |
TCP, UDP |
tacnews |
TAC News |
99 |
TCP, UDP |
metagram |
Metagram Relay |