I saw some programs using the port 13330. What is the meaning of this port? Is this port used by a special program?
This is most definitely not a standard port. I typically use these 3 sites for determining what a TCP port's been designated for:
The first 2 are from IANA - Internet Assigned Numbers Authority. This is THE authority when it comes to designating the usage of numbers on the Internet.
The 3rd link is here for historical purposes. It's related to the IETF - Internet Engineering Task Force. The purpose of the document was to outline how the port numbers would be managed.
NOTE: Linux distributions (and probably others unixoid systems) also have a file called
According to this website, 13330 is not a standard port for TCP (question is tagged as TCP,) so it has no special usage. However, there is no official standard port list, so there is no way to know what ports are official and what ports are not.