The ports numbered 0 through 1023 are thewell-knownsystem ports, reserved for special uses.
Port 0is not used for TCP/UDP communication although it used as a web link programming construct.
The Breakdown of Other System Ports
vaeenma / Getty Images
List of TCP Ports and UDP Ports (Well-Known)
The TCP ports and UDP ports below 1024 are called well-known. Some are far from well-known while others have mainstream usage by popular applications.
