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Most Common Service Names and Their Port Numbers

Most Common Service Names and Their Port Numbers

Generally, the services and its port numbers are used to differentiate between various services that execute over transport protocols such as TCP/IP, UDP, DCCP, and SCTP. The service names were assigned on a first-come, first served process and in different ways, based on three ranges:

  • System Ports (0-1023)
  • User Ports (1024-49151)
  • Dynamic / Private Ports (49152-65535)

However, with the growth of Windows and single-user Linux systems, the port model that were trusted no longer works.

The most common Service names and their Ports are mentioned below:

Service Name Port Number
FTP 20, 21
SSH 22
Telnet 23
SMTP 25
DNS 53
DHCP 67, 68
TFTP 69
HTTP 80
POP3 110
NNTP 119
NTP 123
IMAP4 143
LDAP 389
HTTPS 443
IMAPS 993
RADIUS 1812
AIM 5190

On Linux machines, the following file consists all the list of port assignments for the specific machine:

/etc/services

Whereas, on Windows machines, the following file describes the service names using port numbers with protocols:

C:windows\system32\drivers\etc\services

Mac Wilson

Mac Wilson is a technology writer and a Sales and Marketing Executive at eUKhost Ltd. He loves to write about latest technologies and trends just like cloud computing which are changing the way people do business.

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