Port Assignements
- Port Assignments for Well-Known Ports
or a full description of all port assignments please visit Wikipedia's List of TCP and UDP port numbers web page.
The Well-Known Ports are assigned by the IANA. Ports are used in TCP or UDP communications to name the ends of logical connections that transfer data. For the purpose of providing services to unknown clients, ports were created. the table below specifies the port used by the server process as its contact port. The contact port is sometimes called a Well-Known Port.
The assigned ports use a small portion of the possible port numbers. For many years the assigned ports were in the range 0-255. The range for assigned ports managed by the IANA has been expanded to the range 0-1023. The list below contains most of the port assignments that are significant to the most Windows operating systems (some ports are specific to specific operating systems, this is a general overview).
|
Port No. |
Protocol |
Service Name |
Aliases |
Comment |
|---|---|---|---|---|
|
7 |
TCP |
echo |
|
Echo |
|
7 |
UDP |
echo |
|
Echo |
|
9 |
TCP |
discard |
sink null |
Discard |
|
9 |
UDP |
discard |
sink null |
Discard |
|
13 |
TCP |
daytime |
|
Daytime |
|
13 |
UDP |
daytime |
|
Daytime |
|
17 |
TCP |
qotd |
quote |
Quote of the day |
|
17 |
UDP |
qotd |
quote |
Quote of the day |
|
19 |
TCP |
chargen |
ttytst source |
Character generator |
|
19 |
UDP |
chargen |
ttytst source |
Character generator |
|
20 |
TCP |
ftp-data |
|
File Transfer |
|
21 |
TCP |
ftp |
|
FTP Control |
|
23 |
TCP |
telnet |
|
Telnet |
|
25 |
TCP |
smtp |
|
Simple Mail Transfer |
|
37 |
TCP |
time |
Time | |
|
37 |
UDP |
time |
Time | |
|
39 |
UDP |
rlp |
resource |
Resource Location Protocol |
|
42 |
TCP |
nameserver |
name |
Host Name Server |
|
42 |
UDP |
nameserver |
name |
Host Name Server |
|
43 |
TCP |
nicname |
whois |
Who Is |
|
53 |
TCP |
domain |
|
Domain Name |
|
53 |
UDP |
domain |
|
Domain Name Server |
|
67 |
UDP |
bootps |
dhcps |
Bootstrap Protocol Server |
|
68 |
UDP |
bootpc |
dhcpc |
Bootstrap Protocol Client |
|
69 |
UDP |
tftp |
|
Trivial File Transfer |
|
70 |
TCP |
gopher |
|
Gopher |
|
79 |
TCP |
finger |
|
Finger |
|
80 |
TCP |
http |
www, http |
World Wide Web |
|
88 |
TCP |
kerberos |
krb5 |
Kerberos |
|
88 |
UDP |
kerberos |
krb5 |
Kerberos |
|
101 |
TCP |
hostname |
hostnames |
NIC Host Name Server |
|
102 |
TCP |
iso-tsap |
|
ISO-TSAP Class 0 |
|
107 |
TCP |
rtelnet |
|
Remote Telnet Service |
|
109 |
TCP |
pop2 |
postoffice |
Post Office Protocol - Version 2 |
|
110 |
TCP |
pop3 |
postoffice |
Post Office Protocol - Version 3 |
|
111 |
TCP |
sunrpc |
rpcbind portmap |
SUN Remote Procedure Call |
|
111 |
UDP |
sunrpc |
rpcbind portmap |
SUN Remote Procedure Call |
|
113 |
TCP |
auth |
ident tap |
Authentication Sevice |
|
117 |
TCP |
uucp-path |
|
UUCP Path Service |
|
119 |
TCP |
nntp |
usenet |
Network News Transfer Protocol |
|
123 |
UDP |
ntp |
Network Time Protocol | |
|
135 |
TCP |
epmap |
loc-srv |
DCE endpoint resolution |
|
135 |
UDP |
epmap |
loc-srv |
DCE endpoint resolution |
|
137 |
TCP |
netbios-ns |
nbname |
NETBIOS Name Service |
|
137 |
UDP |
netbios-ns |
nbname |
NETBIOS Name Service |
|
138 |
UDP |
netbios-dgm |
nbdatagram |
NETBIOS Datagram Service |
|
139 |
TCP |
netbios-ssn |
nbsession |
NETBIOS Session Service |
|
143 |
TCP |
imap |
imap4 |
Internet Message Access Protocol |
|
158 |
TCP |
pcmail-srv |
repository |
PC Mail Server |
|
161 |
UDP |
snmp |
snmp |
SNMP |
|
162 |
UDP |
snmptrap |
snmp-trap |
SNMP TRAP |
|
170 |
TCP |
print-srv |
|
Network PostScript |
|
179 |
TCP |
bgp |
|
Border Gateway Protocol |
|
194 |
TCP |
irc |
|
Internet Relay Chat Protocol |
|
213 |
UDP |
ipx |
|
IPX over IP |
|
389 |
TCP |
ldap |
|
Lightweight Directory Access Protocol |
|
443 |
TCP |
https |
MCom |
|
|
443 |
UDP |
https |
MCom |
|
|
445 |
TCP |
|
|
Microsoft CIFS |
|
445 |
UDP |
|
|
Microsoft CIFS |
|
464 |
TCP |
kpasswd |
Kerberos (v5) | |
|
464 |
UDP |
kpasswd |
Kerberos (v5) | |
|
500 |
UDP |
isakmp |
ike |
Internet Key Exchange (IPSec) |
|
512 |
TCP |
exec |
|
Remote Process Execution |
|
512 |
UDP |
biff |
comsat |
Notifies users of new mail |
|
513 |
TCP |
login |
|
Remote Login |
|
513 |
UDP |
who |
whod |
Database of who's logged on, average load |
|
514 |
TCP |
cmd |
shell |
Automatic Authentication |
|
514 |
UDP |
syslog |
|
|
|
515 |
TCP |
printer |
spooler |
Listens for incoming connections |
|
517 |
UDP |
talk |
|
Establishes TCP Connection |
|
518 |
UDP |
ntalk |
|
|
|
520 |
TCP |
efs |
|
Extended File Name Server |
|
520 |
UDP |
router |
router routed |
RIPv.1, RIPv.2 |
|
525 |
UDP |
timed |
timeserver |
Timeserver |
|
526 |
TCP |
tempo |
newdate |
Newdate |
|
530 |
TCP,UDP |
courier |
rpc |
RPC |
|
531 |
TCP |
conference |
chat |
IRC Chat |
|
532 |
TCP |
netnews |
readnews |
Readnews |
|
533 |
UDP |
netwall |
|
For emergency broadcasts |
|
540 |
TCP |
uucp |
uucpd |
Uucpd |
|
543 |
TCP |
klogin |
|
Kerberos login |
|
544 |
TCP |
kshell |
krcmd |
Kerberos remote shell |
|
550 |
UDP |
new-rwho |
new-who |
New-who |
|
556 |
TCP |
remotefs |
rfs rfs_server |
Rfs Server |
|
560 |
UDP |
rmonitor |
rmonitord |
Rmonitor |
|
561 |
UDP |
monitor |
|
|
|
636 |
TCP |
ldaps |
sldap |
LDAP over TLS/SSL |
|
749 |
TCP |
kerberos-adm |
|
Kerberos administration |
|
749 |
UDP |
kerberos-adm |
|
Kerberos administration |