website hosting port number
A port is always associated with an IP address of a host and the protocol type of the communication, and thus completes the destination or origination network address of a communication session. A port is identified for each address and protocol by a 16-bit number, commonly known as the port number. For example, an address may be protocol: TCP, IP address: 1.2.3.4, port number: 80, which may be written 1.2.3.4:80 when the protocol is known from context. Specific port numbers are often used to identify specific services.