Well Known Ports is a term used for the virtual port numbers used by various TCP and UDP services running over Internet Protocol. These port numbers are registered and managed by a group called the Internet Assigned Names Authority (IANA). This list is sometimes referred to as the "ports and protocols" list for Internet Protocol and TCP/UDP services.
These ports are broken down into ranges:
| Category | Port Range | Assignment/Use |
|---|---|---|
| System Ports | 0 - 1023 | Assigned by IETF process for standards-track protocols. Typically used by by listener daemons (ex: telnetd, sshd, ntpd, named, ftpd, httpd) at the "server" side of a connection. |
| User Ports | 1024 - 49151 | Assigned by IANA as per the "Expert Review" process. |
| Dynamic and/or Private Ports | 49152 - 65535 | Not assigned at all and free for any use, but expect possible conflicts. |
Assigned Internet Protocol Numbers
From: IANA Service Names and Port Numbers Text File
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