Commonly used networking ports

Port Number     Service name Transport protocolDescription
7EchoTCP, UDPEcho service
20FTP-data TCP, SCTPFile Transfer Protocol data transfer
21FTP TCP, UDP, SCTPFile Transfer Protocol (FTP) control connection
22SSH-SCPTCP, UDP, SCTP  Secure Shell, secure logins, file transfers (scp, sftp), and port forwarding
23TelnetTCPTelnet protocol—unencrypted text communications
25SMTPTCP Simple Mail Transfer Protocol used for email routing between mail servers
53DNSTCP, UDP Domain Name System name resolver
69TFTPUDPTrivial File Transfer Protocol
80HTTPTCP, UDP, SCTPHypertext Transfer Protocol (HTTP) uses TCP in versions 1.x and 2. HTTP/3 uses QUIC, a transport protocol on top of UDP
88KerberosTCP, UDPNetwork authentication system
102Iso-tsapTCPISO Transport Service Access Point (TSAP) Class 0 protocol
110POP3TCPPost Office Protocol, version 3 (POP3)
135Microsoft EPMAPTCP, UDPMicrosoft EPMAP (End Point Mapper), also known as DCE/RPC Locator service, is used to remotely manage services, including DHCP server, DNS server and WINS. Also used by DCOM
137NetBIOS-nsTCP, UDP NetBIOS Name Service, used for name registration and resolution
139NetBIOS-ssnTCP, UDPNetBIOS Session Service
143IMAP4TCP, UDP Internet Message Access Protocol (IMAP), management of electronic mail messages on a server
381HP OpenviewTCP, UDPHP data alarm manager
383HP OpenviewTCP, UDPHP data alarm manager
443HTTP over SSLTCP, UDP, SCTPHypertext Transfer Protocol Secure (HTTPS) uses TCP in versions 1.x and 2. HTTP/3 uses QUIC, a transport protocol on top of UDP.
464KerberosTCP, UDPKerberos Change/Set password
465SMTP over TLS/SSL, SSMTCPAuthenticated SMTP over TLS/SSL (SMTPS), URL Rendezvous Directory for SSM (Cisco protocol)
587SMTPTCPEmail message submission
593Microsoft DCOMTCP, UDPHTTP RPC Ep Map, Remote procedure call over Hypertext Transfer Protocol, often used by Distributed Component Object Model services and Microsoft Exchange Server
636LDAP over TLS/SSLTCP, UDPLightweight Directory Access Protocol over TLS/SSL
691MS ExchangeTCPMS Exchange Routing
902VMware ServerunofficialVMware ESXi
989FTP over SSLTCP, UDPFTPS Protocol (data), FTP over TLS/SSL
990FTP over SSLTCP, UDP FTPS Protocol (control), FTP over TLS/SSL
993IMAP4 over SSLTCPInternet Message Access Protocol over TLS/SSL (IMAPS)
995POP3 over SSLTCP, UDPPost Office Protocol 3 over TLS/SSL
1025Microsoft RPCTCPMicrosoft operating systems tend to allocate one or more unsuspected, publicly exposed services (probably DCOM, but who knows) among the first handful of ports immediately above the end of the service port range (1024+).
1337WASTEunofficialWASTE Encrypted File Sharing Program
1589Cisco VQPTCP, UDPCisco VLAN Query Protocol (VQP)
1725SteamUDPValve Steam Client uses port 1725 
2082cPanelunofficialcPanel default
2083radsec, cPanelTCP, UDP Secure RADIUS Service (radsec), cPanel default SSL
2483Oracle DBTCP, UDPOracle database listening for insecure client connections to the listener replaces port 1521
2484Oracle DBTCP, UDPOracle database listening for SSL client connections to the listener
2967Symantec AVTCP, UDPSymantec System Center agent (SSC-AGENT)
3074XBOX LiveTCP, UDPXbox LIVE and Games for Windows – Live
3306MySQLTCP MySQL database system
3724World of WarcraftTCP, UDPSome Blizzard games, Unofficial Club Penguin Disney online game for kids
4664Google DesktopunofficialGoogle Desktop Search
5432PostgreSQLTCPPostgreSQL database system
5900RFB/VNC ServerTCP, UDPvirtual Network Computing (VNC) Remote Frame Buffer RFB protocol
6665IRCTCPInternet Relay Chat 
6669IRCTCPInternet Relay Chat 
6881BitTorrentunofficialBitTorrent is part of the full range of ports used most often
6999BitTorrentunofficialBitTorrent is part of the full range of ports used most often
6970QuicktimeunofficialQuickTime Streaming Server
8086Kaspersky AVTCPKaspersky AV Control Center
8087Kaspersky AVUDPKaspersky AV Control Center
8222VMware ServerTCP, UDPVMware Server Management User Interface (insecure Web interface).
9100PDLTCPPDL Data Stream, used for printing to certain network printers[1
10000BackupExecunofficialWebmin, Web-based Unix/Linux system administration tool (default port)
12345NetBusunofficialNetBus remote administration tool (often Trojan horse).
27374Sub7unofficialSub7 default
18006Back OrificeunofficialBack Orifice 2000 remote administration tools