Port numbers and services

Well-known ports: 0-1023

Registered ports: 1024-49,151

Dynamic ports: 49,152-65,535

Most common ports and services:

Protocol name	TCP/UDP	Port number
File Transfer Protocol (FTP)	TCP	20, 21
Secure Shell (SSH)	TCP	22
Telnet	TCP	23
Simple Mail Transfer Protocol (SMTP)	TCP	25
Domain Name System (DNS)	TCP/UDP	53
Dynamic Host Configuration Protocol (DHCP)	UDP	67, 68
Trivial File Transfer Protocol (TFTP)	UDP	69
Hypertext Transfer Protocol (HTTP)	TCP	80
Post Office Protocol version 3 (POP3)	TCP	110
NetBIOS	TCP/UDP	137, 138, 139
Internet Message Access Protocol (IMAP)	TCP	143
Simple Network Management Protocol (SNMP)	UDP	161, 162
Lightweight Directory Access Protocol (LDAP)	TCP	389
Hypertext Transfer Protocol over SSL/TLS (HTTPS)	TCP	443
Lightweight Directory Access Protocolover TLS/SSL (LDAPS)	TCP	636
FTPS — FTP over SSL/TLS	TCP	989, 990
IMAPS — IMAP over SSL/TLS	TCP	993
POPS — POP over SSL/TLS	TCP	995
MSSQL — Microsoft SQL Server	TCP	1433
MySQL	TCP	3306
Remote Desktop Protocol (RDP)	TCP	3389
Oracle DB	TCP	2483, 2484
VNC Server	TCP	5500, 5900
PCAnywhere	TCP	5631, 5632
X11	TCP	6000, 6001

Note

For a complete list of references, check out https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers.