Matching Pairs Port number comptia a+Online version port numbers by Soul Whitfield 1 Telnet 2 NetBIOS 3 HTTPS 4 NetBIOS 5 SMTP 6 SNMP Query 7 SSH 8 DHCP 9 SMB 10 SNMP Trap 11 FTP 12 DNS 13 LDAP 14 HTTP 15 IMAP4 16 RDP 17 POP3 tcp/3389 tcp/25 tcp/110 udp/161 udp/67, udp/68 tcp/139 tcp/445 tcp/20, tcp21 tcp/80 tcp/443 tcp/389 udp/137 tcp/22 udp/53, tcp/53 udp/162 tcp/23 tcp/143