Port Number Allocation

Port numbers 1 - 1023 are reserved for “well-known” applications/OS services

1024 - 10,000 are registered for certain “well-known” protocols

Example:

• port 80 is reserved for HTTP

• port 25 is reserved for simple mail transfer protocol

• port 1080 is used by SOCKS (network firewall security)

See the IANA : RFC 1700 or http://www.isi.edu/in-notes/rfc1700.txt

NB. : What is a Request For Comment ?

How IP has been built, Released by the Internet Architecture Board (IAB)