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Port Number is most common thing for every system admin working with the Linux operating system. As a system admin you should know all the port numbers relating to various function relating to port numbers. The Linux Firewall Software is purely depended on the port numbers. You can add the port number to the allowed or deny rules in the firewall rules pages on firewall software’s. Most of the websites are running with the back-end support of Linux operating system this is possible due to the adoption of Linux operating system in hosting industries. Most of the website allows only and open only port 80 and port 443 for connections. This cheat sheet provides the category based Commonly Used Port Numbers for Linux System Administrators.

Web based Port Numbers

SERVICE NAME PORT NO.
HTTP 80
HTTPS (HTTP with SSL) 443
FTP 21
SFTP 22
FTPs 990
SSH 22
WebDisk 2077
WebDisk with SSL 2078
MYSQL 3306
TFTP 69

E-Mail based Port Numbers

SERVICE NAME PORT NO.
SMTP 25
SMTP with SSL 465
SMTP Alternate 26, 587
IMAP 143
IMAP with SSL 993
POP3 110
POP3 with SSL 995

Web Control Panel based Port Numbers

SERVICE NAME PORT NO.
WHM 2086
WHM with SSL 2087
cPanel 2082
cPanel with SSL 2083
Plesk 8880
Plesk with SSL 8443

Server based Port Numbers

SERVICE NAME PORT NO.
WHOIS 43
Telnet 23
DNS 53
DHCP 67
Kerberos 88, 464
LDAP 389
SOCKS Proxy 1080
OpenVPN 1194
RADIUS 1812, 1813
NFS 2049
RSYNC 873

That’s all for now.

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