Common Network Ports
PortUsageTransport Protocol20FTP Data TransferTCP21FTP Command ControlTCP22SSHTCP/UDP23TelnetTCP25SMTPTCP50, 51IPSec53DNSTCP/UDP67, 68DHCPUDP69TFTPUDP80HTTPTCP110POP3TCP119NNTPTCP123NTPUDP135-139NetBIOSTCP/UDP143IMAPTCP/UDP161, 162SNMPTCP/UDP194IRC389LDAPTCP/UDP443HTTPSTCP/UDP989, 990FTP over SSL/TLSTCP3389RDPTCP/UDP