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.