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Common Port Numbers

If you want a really nice comprehensive list you should check the Wikipedia link in the references section at the bottom of the page.

Here are the ports that you really should know:

Port Service Transport protocol
7 Echo  
20 File Transfer Protocol (FTP) Data Transfer TCP
21 File Transfer Protocol (FTP) Command Control TCP
22 Secure Shell (SSH) TCP / UDP
23 Telnet TCP
25 Simple Mail Transfer Protocol (SMTP) (email) TCP
37 Time  
42 Host Name Server (Nameserv)  
43 WhoIs  
50 IPSec  
51 IPSec  
53 Domain Name System (DNS) TCP / UDP
67 Dynamic Host Configuration Protocol (DHCP) / BOOTP UDP
68 Dynamic Host Configuration Protocol (DHCP) / BOOTP UDP
69 Trivial File Transfer Protocol (TFTP) UDP
80 HyperText Transfer Protocol (HTTP) (web) TCP
110 Post Office Protocol (POP3) (email) TCP
115 Simple File Transfer Protocol (SFTP)  
119 Network News Transport Protocol (NNTP) TCP
123 Network Time Protocol (NTP) UDP
135 DCE/RPC, DCOM  
137 NetBIOS (Name service) TCP / UDP
138 NetBIOS (Datagram distribution service) UDP
139 NetBIOS (Session service) TCP
143 Internet Message Access Protocol (IMAP4) (email) TCP / UDP
156 SQL Server  
161 Simple Network Management Protocol (SNMP) TCP / UDP
162 Simple Network Management Protocol (SNMPTRAP) TCP / UDP
194 Internet Relay Chat (IRC)  
389 Lightweight Directory Access Protocol (LDAP) TCP / UDP
443 HTTPS - HTTP with Secure Sockets Layer (SSL) TCP / UDP
445 SMB/CIFS (Samba/Windows Sharing) (Microsoft-DS) TCP
546 DHCP Client  
547 DHCP Server  
3306 MySQL  
3389 Remote Desktop Protocol TCP / UDP

References