| 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 |
EchoProtocol (RFC 862) |
| 8 |
|
Unassigned |
Unassigned |
| 9 |
TCP, UDP |
discard, sink, null |
DiscardProtocol (RFC 863) |
| 10 |
|
Unassigned |
Unassigned |
| 11 |
TCP, UDP |
systat, users |
ActiveUsersProtocol (RFC 866) |
| 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 |
QuoteOfTheDayProtocol (RFC 865) |
| 18 |
TCP, UDP |
msp |
MessageSendProtocol (RFC 1159, RFC 1312) |
| 19 |
TCP, UDP |
chargen, ttytst, source |
CharacterGeneratorProtocol (RFC 864) |
| 20 |
TCP |
ftp-data |
Default FTP data port |
| 21 |
TCP |
ftp |
FileTransferProtocol (RFC 959) |
| 22 |
TCP |
ssh |
SecureShell (draft) |
| 23 |
TCP |
telnet |
Telnet (RFC 854) |
| 24 |
TCP, UDP |
Reserved |
Any private mail system |
| 25 |
TCP |
smtp |
SimpleMailTransferProtocol (RFC 2821) |
| 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 |
RouteAccessProtocol (RFC 1476) |
| 39 |
UDP |
rlp |
ResourceLocationProtocol (RFC 887) |
| 40 |
|
Unassigned |
Unassigned |
| 41 |
TCP, UDP |
grapics |
Graphics |
| 42 |
UDP |
nameserver |
Internet Name Server (IEN 116) |
| 43 |
TCP |
whois, nicname |
WhoisProtocol (RFC 954) |
| 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 |
TacacsProtocol (RFC 1492) |
| 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 |
DomainNameSystem (many RFCs) |
| 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 |
TrivialFileTransferProtocol (RFC 1350) |
| 70 |
TCP, UDP |
gopher |
GopherProtocol (RFC 1436) |
| 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 |
FingerProtocol (RFC 1288) |
| 80 |
TCP, UDP |
www, http |
Hyper_Text_Transfer_Protocol |
| 81 |
TCP, UDP |
hosts2-ns |
HOSTS2 Name Server (More commonly used as an alternate HTTP port) |
| 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 (More commonly used by PointCast) |
| 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 |
