PORTS
20 & 21 : File Transfer Protocol (FTP) 22 : Secure Shell (SSH) 23 : Telnet remote login service 25 : Simple Mail Transfer Protocol (SMTP) 53 : Domain Name System (DNS) service 80 : Hypertext Transfer Protocol (HTTP) used in the World Wide Web 110 : Post Office Protocol (POP3) 119 : Network News Transfer Protocol (NNTP) 143 : Internet Message Access Protocol (IMAP) 161 : Simple Network Management Protocol (SNMP) 194 : Internet Relay Chat (IRC) 443 : HTTP Secure (HTTPS) 465 : SMTP Secure (SMTPS)