what is a port number on a computer

Best answer


A port numberuniquely identifies a network-based application on a computer. Each application/program is allocated a 16-bit integer port number. This number is assigned automatically by the OS, manually by the user or is set as a default for some popular applications.

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  • What is a port number and how to find it?

  • Port numbers are like extensions to your IP address. For example, your computer鈥檚 IP address is 53.125.105.18, while the file transfer protocol (FTP) port number is 20. Thus, the IP for an open FTP port would be 12.345.678.90:20.

  • Why do we need a port number for each protocol?

  • Every protocol in a computer network has a unique ID, now the question is why do we need this port number, and what is the use of it. Let鈥檚 take an example, in a network there are 10 computers connected together and out of 10 computers one is a DHCP server, and the remaining nine are DHCP hosts who all are getting IP Addresses from the DHCP server.

  • What is the difference between IP address and port number?

  • Internet Protocol address (IP address) used to identify a host in network. Port number is used to identify an processes/services on your system. 02. IPv4 is of 32 bits (4 bytes) size and for IPv6 is 128 bits (16 bytes). The Port number is 16 bits numbers. 03. IP address is the address of the layer-3 IP protocol.

  • What is a port in computer?

  • A port may refer to any of the following: 1. When referring to a physical device, a hardware port or peripheral port is a hole or connection found on the front or back of a computer. Ports allow computers to access external devices such as printers.

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