Common Ports
The Common Ports are assigned by the IANA and on most systems can only be used by system (or root) processes or by programs executed by privileged users.
Ports are used in the TCP [RFC793] to name the ends of logical connections which carry long term conversations. For the purpose of providing services to unknown callers, a service contact port is defined. This list specifies the port used by the server process as its contact port.


Port Assignments for Common Ports:

Port UDP TCP Definition
7 x x echo
9 x x discard
11 x x systat
13 x x daytime
17 x x quote of the day
19 x character generator
20 x ftp - data
21 x ftp - control
23 x telnet
25 x smtp mail transfer
37 x x timeserver
39 x rlp resource location
42 x x nameserver
43 x nicname whois
53 x x dommainlein name server
67 x bootpc bootstrap protocol
68 x bootpc bootstrap protocol
69 x tftp trivial file transfer
70 x gopher
79 x finger
80 x http
88 x x kerberos
101 x hostname nic
102 x iso-tsap class 0
107 x rtelnet
109 x pop2
110 x pop3
111 x x sunrpc
113 x identification protocol
117 x uucp
119 x nntp
123 x ntp
135 x x epmap
137 x x netbios - name service
138 x netbios - dgm
139 x netbios - ssn
143 x imap
158 x pcmail - srv
161 x snmp
162 x snmptrap
170 x print - srv
179 x border gateway protocol
194 x irc internet relay chat
213 x ipx
389 x ldap
443 x x https (ssl)
445 x x microsoft - ds
464 x x kpasswd
500 x isakmp key exchange
512 x x remote execute
513 x x login / who
514 x x shell cmd / syslog
515 x printer spooler
517 x talk
518 x ntalk
520 x x router / efs
525 x timeserver
526 x tempo
530 x rpc
531 x conference chat
532 x netnews newsreader
533 x netwall
540 x uucp
543 x klogin
544 x kshell
550 x new - rwho
556 x remotefs
560 x rmonitor
561 x monitor
636 x ldaps over tls/ssl
666 x x doom id software
749 x x kerberos administration
750 x kerveros version iv
1109 x kpop
1167 x phone
1433 x x ms - sql - server
1434 x x ms - sql - monitor
1512 x x wins
1524 x ingreslock
1701 x l2tp
1723 x pptp point to point
1812 x radius authentication
1813 x radius accounting
2049 x nfs server
2053 x kerberos de - multiplexor
9535 x man remote server