2008 Oct 18

A socket address in the Internet namespace consists of a machine's Internet address plus a port number which distinguishes the sockets on a given machine (for a given protocol). Port numbers range from 0 to 65,535 (gnu).

Use the command netscan -na to see which ports are actively listening or sending data.

Well Known Ports01023
Registered Ports102449151
Dynamic and/or Private Ports4915265535
Port Scanners
Nmap, by Fyodor
Strobe, by Julian Assange
Ultrascan, for Win NT

Internal Links

Port List 1 Port List 2 Port List 3 Port List 4
Needed Ports Ports To Block

External Links

Internet Ports Database
Internet ports, services and trojans
Internet Port and trojans
Port knowledgebase
UNLV Center For Cybermedia Research Internet Ports Database
TCP/IP Ports
Companion for above
TCP and UDP Port Assignments
Port Test
port Info
Port Tests (137)
Windows XP tweaks and Secrets Related to Ports
Network Ports
Ports and Protocols, IBM