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TCP/UDP Port Number Reference
Guide picks
IP networking uses the concept of protocol "ports" at the transport layer to manage communication channels between programs. Many TCP/IP port numbers are associated with specific applications as explained below.

FAQ #12 - What Is a Port Number?
What is a port number? Part of the Computer Networking FAQ list.

TCP Port and UDP Port Number Glossary
Reference for TCP and UDP port numbers used by TCP/IP.

TCP and UDP Port Assignments
From the Windows 2000 Resource Kit, Microsoft documents port assignments for protocols and commonly-used services in easy-to-read and downloadable formats.

TCP/IP Port Numbers
List of assigned or "well-known" port numbers for both TCP and UDP.

Port Numbers and Services Database
Listings for the identity of both well-known and registered TCP/UDP port numbers.

IP Port Numbers
Another listing of well-known and reserved ports with mention of the dynamic port number range.

TDP/UDP Port Numbers
Yet another port number listing, this one with additional hyperlinks to navigate to a specific numeric range.

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