Port Number Reference

TCP, UDP, and SCTP all use port numbers to identify the logical communications between hosts. The combination of a port and IP address identifies a TCP/UDP/SCTP Endpoint, and the endpoint pairs on either end of a "connection" make up a TCP/UDP/SCTP Conversation.

As the underlying IP protocol can "only" transfer data between two IP hosts, it's often desired to transfer TCP/UDP data from more than one application between two IP hosts.

The concept of a TCP/UDP port is to provide several logical channels between the same IP hosts. When sending a packet, TCP/UDP multiplexes the data from separate applications over one IP "host to host transfer". While receiving, TCP/UDP demultiplexes the IP packets again, providing the received data to the applications interested in.

The addressing of this multiplexing/demultiplexing is done using the ports.


Port numbers are unsigned 16-bit integers, ranging from 0 to 65535. The IANA list of assigned port numbers has divided ports into three ranges:

Ports 1024 and above are also referred to as ephemeral ports.

Ports are officially registered with the IANA. Unofficial lists are maintained by many people, including the following:

A local list is maintained below:

0 - 99

100 - 199

200 - 299

300 - 399

400 - 499

500 - 599

600 - 699

700 - 799

800 - 899

900 - 999

1000 - 1099

1100 - 1199

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PortReference (last edited 2008-04-12 17:50:40 by localhost)