Port Numbers In Computer Networks Port Numbers In Computer Networks


Port Numbers In Computer NetworksPort Numbers In Computer Networks



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A port is an endpoint of communication in an operating system. While the term is also used for female connectors on hardware devices, in software it is a logical construct that identifies a specific process or a type of network service.

When referring to a network or to the Internet, a software or network port is a location where information is sent. For example, port 80 is the HTTP network port. A listing of commonly known and used ports can also be found on the below listing.

  • 18 – MSP (Message Send Protocol)
  • 20 - FTP (File Transfer Protocol) for data transfer
  • 21 – FTP (File Transfer Protocol) for data control
  • 23 – Telnet
  • 22 – SSH - Remote Login Protocol
  • 25 - SMTP (Simple Mail Transfer Protocol) for is used for sending mails.
  • 53 – DNS (Domain Name System)
  • 67 – DHCP (Dynamic Host Configuration Protocol) for sending data to the server – Bootps
  • 68 – DHCP (Dynamic Host Configuration Protocol) for data to the client - Bootpc
  • 80 – HTTP (Hypertext Transfer Protocol)
  • 109 – POP2
  • 110 - POP3 (Post Office Protocol) used for receiving mails but it uses log-in process.
  • 119 – NNTP (Network News Transfer Protocol)
  • 137 – NetBIOS Name Service
  • 139 – NetBIOS Datagram Service
  • 143 – IMAP4 (Interim Mail Access Protocol) used for receiving mails.
  • 150 – NetBIOS Session Service
  • 161 – SNMP
  • 179 – BGP (Border Gateway Protocol)
  • 389 – LDAP (Lightweight Directory Access Protocol)
  • 443 – HTTPS (HTTP-secure)
  • 546 – DHCP Client
  • 547 – DHCP Server
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