Important Linux Port Numbers

21 => FTP
22 => SSH
23 => Telnet
25 => SMTP Mail Transfer
43 => WHOIS service
53 => name server (DNS)
80 => HTTP (Web server)
110 => POP protocol (for email)
995 => POP over SSL
3306 => MysQL Server
111 => rpcbind
953 => rndc
143 => IMAP Protocol (for email)
993 => IMAP Secure
443 => HTTP Secure
3128 => Squid Proxy
3306 => MysQL Server
3636 => Piranha
4643 => Virtuosso Power Panel
10000 => Webmin

For more port numbers Click Here 
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