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Official if the application and port combination is in the IANA list of port assignments.

The boxes below indicate a status with the following colors and tags: This misuse may be, for example, by a Trojan horse, or alternatively by a commonly used program that did not get an IANA registered port or port range. Sometimes ports may be used for different applications or protocols than their official IANA designation. IANA does not enforce this it is simply a set of recommended uses. These ports are not permanently assigned to any publicly defined application.

Randomly chosen port numbers out of this range are called ephemeral ports. The Dynamic and/or Private Ports are those in the range 49152–65535.The Registered Ports are those in the range 1024–49151.On Unix-like operating systems, opening a port in this range to receive incoming connections requires administrative privileges or possessing of CAP_NET_BIND_SERVICE capability.

The Well Known Ports are those in the range 0–1023.The port numbers are divided into three ranges.