List of Important Ports

Service Name and Transport Protocol Port

20, 21 File Transfer Protocol (FTP) TCP
22 Secure Shell (SSH) TCP and UDP
23 Telnet TCP
25 Simple Mail Transfer Protocol (SMTP) TCP
50, 51 IPSec
53 Domain Name Server (DNS) TCP and UDP
67, 68 Dynamic Host Configuration Protocol (DHCP) UDP

69 Trivial File Transfer Protocol (TFTP) UDP
80 HyperText Transfer Protocol (HTTP) TCP
110 Post Office Protocol (POP3) TCP
119 Network News Transport Protocol (NNTP) TCP
123 Network Time Protocol (NTP) UDP
135-139 NetBIOS TCP and UDP
143 Internet Message Access Protocol (IMAP4) TCP and UDP
161, 162 Simple Network Management Protocol (SNMP) TCP and UDP
389 Lightweight Directory Access Protocol TCP and UDP
443 HTTP with Secure Sockets Layer (SSL) TCP and UDP


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