Well-known Ports Lookup
Search well-known and registered TCP/UDP ports by number, service name or description to see what normally listens there. Everything runs in your browser.
188 ports
System (0-1023) Registered (1024-49151) Dynamic / Private (49152-65535)
| Port | Protocol | Service | Description |
|---|---|---|---|
| TCP | ftp-data | File Transfer Protocol (data channel) | |
| TCP | ftp | File Transfer Protocol (control channel) | |
| TCP | ssh | Secure Shell remote login and tunneling | |
| TCP | telnet | Telnet remote login (unencrypted) | |
| TCP | smtp | Simple Mail Transfer Protocol (mail relay) | |
| TCP | time | Time Protocol | |
| UDP | time | Time Protocol | |
| UDP | rlp | Resource Location Protocol | |
| TCP | nameserver | Host Name Server / WINS | |
| TCP | whois | WHOIS directory service | |
| TCP | tacacs | Terminal Access Controller Access-Control System | |
| TCP | dns | Domain Name System (zone transfers and large replies) | |
| UDP | dns | Domain Name System (standard queries) | |
| UDP | dhcp-server | Dynamic Host Configuration Protocol (server) | |
| UDP | dhcp-client | Dynamic Host Configuration Protocol (client) | |
| UDP | tftp | Trivial File Transfer Protocol | |
| TCP | gopher | Gopher information retrieval protocol | |
| TCP | finger | Finger user information service | |
| TCP | http | Hypertext Transfer Protocol (the web) | |
| TCP | http-alt | HTTP alternate (Tor bridges and proxies) | |
| TCP | kerberos | Kerberos authentication | |
| UDP | kerberos | Kerberos authentication | |
| TCP | iso-tsap | ISO Transport Service Access Point / Siemens HMI | |
| TCP | pop3 | Post Office Protocol v3 (mail retrieval) | |
| TCP | rpcbind | ONC RPC port mapper | |
| UDP | rpcbind | ONC RPC port mapper | |
| TCP | ident | Ident / auth user identification | |
| TCP | nntp | Network News Transfer Protocol (Usenet) | |
| UDP | ntp | Network Time Protocol clock synchronisation | |
| TCP | msrpc | Microsoft RPC Endpoint Mapper | |
| UDP | netbios-ns | NetBIOS Name Service | |
| UDP | netbios-dgm | NetBIOS Datagram Service | |
| TCP | netbios-ssn | NetBIOS Session Service | |
| TCP | imap | Internet Message Access Protocol | |
| UDP | snmp | Simple Network Management Protocol | |
| UDP | snmptrap | SNMP Trap notifications | |
| UDP | xdmcp | X Display Manager Control Protocol | |
| TCP | bgp | Border Gateway Protocol routing | |
| TCP | irc | Internet Relay Chat | |
| TCP | at-rtmp | AppleTalk Routing Maintenance | |
| UDP | ipx | IPX network routing | |
| UDP | imap3 | Interactive Mail Access Protocol v3 | |
| UDP | tsp | Time Stamp Protocol | |
| UDP | ptp-event | Precision Time Protocol event messages | |
| UDP | ptp-general | Precision Time Protocol general messages | |
| TCP | ldap | Lightweight Directory Access Protocol | |
| UDP | ldap | Lightweight Directory Access Protocol | |
| TCP | https | Hypertext Transfer Protocol over TLS (secure web) | |
| TCP | snpp | Simple Network Paging Protocol | |
| TCP | smb | Microsoft SMB file and print sharing | |
| TCP | kpasswd | Kerberos password change | |
| UDP | kpasswd | Kerberos password change | |
| TCP | smtps | SMTP over implicit TLS (mail submission) | |
| UDP | isakmp | IPsec IKE key exchange | |
| TCP | exec | Remote process execution (rexec) | |
| UDP | biff | Mail notification service | |
| TCP | login | Remote login (rlogin) | |
| TCP | shell | Remote shell (rsh) | |
| UDP | syslog | System logging service | |
| TCP | lpd | Line Printer Daemon | |
| UDP | rip | Routing Information Protocol | |
| UDP | ripng | Routing Information Protocol next generation | |
| TCP | uucp | Unix-to-Unix Copy | |
| TCP | afp | Apple Filing Protocol | |
| TCP | rtsp | Real Time Streaming Protocol | |
| TCP | submission | SMTP message submission (STARTTLS) | |
| TCP | ipp | Internet Printing Protocol | |
| TCP | ldaps | LDAP over TLS/SSL | |
| TCP | ldp | Label Distribution Protocol (MPLS) | |
| TCP | rsync | rsync file synchronisation | |
| TCP | vmware-server | VMware ESXi / vCenter console | |
| TCP | ftps-data | FTP over TLS (data channel) | |
| TCP | ftps | FTP over TLS (control channel) | |
| TCP | imaps | IMAP over implicit TLS | |
| TCP | pop3s | POP3 over implicit TLS | |
| TCP | msrpc-alt | Microsoft RPC / NFS-or-IIS dynamic range | |
| TCP | lsa-or-nt | Windows LSA / remote RPC | |
| TCP | socks | SOCKS proxy | |
| UDP | socks | SOCKS proxy | |
| UDP | openvpn | OpenVPN tunnel (default UDP) | |
| TCP | openvpn | OpenVPN tunnel (TCP fallback) | |
| TCP | misc | Common hobby / CTF service port | |
| TCP | mssql | Microsoft SQL Server database | |
| TCP | ms-sql-m | Microsoft SQL Server monitor | |
| UDP | ms-sql-m | Microsoft SQL Server browser | |
| TCP | oracle | Oracle database listener | |
| UDP | l2tp | Layer 2 Tunneling Protocol | |
| TCP | pptp | Point-to-Point Tunneling Protocol | |
| UDP | pptp | Point-to-Point Tunneling Protocol | |
| UDP | radius | RADIUS authentication | |
| UDP | radius-acct | RADIUS accounting | |
| TCP | mqtt | MQTT message broker (plain) | |
| UDP | ssdp | Simple Service Discovery Protocol (UPnP) | |
| TCP | nfs | Network File System | |
| UDP | nfs | Network File System | |
| UDP | netflow | Cisco NetFlow export | |
| TCP | cpanel | cPanel web hosting control panel | |
| TCP | cpanel-ssl | cPanel control panel over TLS | |
| TCP | whm | WebHost Manager | |
| TCP | whm-ssl | WebHost Manager over TLS | |
| TCP | cpanel-webmail | cPanel webmail (HTTP) | |
| TCP | cpanel-webmail-ssl | cPanel webmail (HTTPS) | |
| TCP | zookeeper | Apache ZooKeeper client connection | |
| TCP | docker | Docker REST API (unencrypted) | |
| TCP | docker-s | Docker REST API (TLS) | |
| TCP | etcd-client | etcd client API | |
| TCP | etcd-server | etcd peer communication | |
| TCP | http-dev | Node.js, Grafana and developer web servers | |
| TCP | xbox-live | Xbox Live / game networking | |
| UDP | xbox-live | Xbox Live / game networking | |
| TCP | squid | Squid HTTP proxy cache | |
| TCP | iscsi | iSCSI target | |
| TCP | ldap-gc | LDAP Global Catalog | |
| TCP | ldaps-gc | LDAP Global Catalog over TLS | |
| TCP | mysql | MySQL / MariaDB database | |
| UDP | traceroute | traceroute probe port | |
| TCP | rdp | Microsoft Remote Desktop (RDP) | |
| UDP | rdp | Microsoft Remote Desktop (RDP over UDP) | |
| TCP | stun | STUN / TURN NAT traversal | |
| UDP | stun | STUN / TURN NAT traversal | |
| TCP | svn | Subversion version control | |
| TCP | http-alt | Development web servers (Phoenix, Jekyll) | |
| TCP | epmd | Erlang Port Mapper Daemon | |
| TCP | krb524 | Kerberos v4 to v5 conversion / Metasploit | |
| UDP | ipsec-nat-t | IPsec NAT traversal | |
| TCP | salt-publish | Salt master publish bus | |
| TCP | salt-return | Salt master return bus | |
| UDP | vxlan | VXLAN overlay networking | |
| TCP | glassfish | GlassFish / Payara admin console | |
| TCP | http-dev | Flask, UPnP and developer web servers | |
| UDP | upnp | UPnP / SSDP discovery | |
| TCP | sip | Session Initiation Protocol | |
| UDP | sip | Session Initiation Protocol | |
| TCP | sips | SIP over TLS | |
| TCP | xmpp-client | XMPP client connection | |
| TCP | xmpp-server | XMPP server-to-server federation | |
| UDP | mdns | Multicast DNS (Bonjour) | |
| TCP | postgres | PostgreSQL database | |
| TCP | amqps | AMQP over TLS | |
| TCP | amqp | AMQP message broker (RabbitMQ) | |
| UDP | coap | Constrained Application Protocol | |
| TCP | vnc | Virtual Network Computing remote desktop | |
| TCP | vnc-1 | VNC display :1 | |
| TCP | teamviewer | TeamViewer remote support | |
| TCP | couchdb | Apache CouchDB database | |
| TCP | winrm | Windows Remote Management (HTTP) | |
| TCP | winrm-ssl | Windows Remote Management (HTTPS) | |
| TCP | x11 | X Window System display | |
| TCP | activemq | Apache ActiveMQ OpenWire | |
| TCP | redis | Redis key-value store | |
| TCP | kubernetes | Kubernetes API server | |
| TCP | syslog-tls | Syslog over TLS | |
| TCP | irc | Internet Relay Chat (alternate) | |
| TCP | ircs | Internet Relay Chat over TLS | |
| TCP | realserver | RealAudio / RealServer | |
| TCP | http-alt | HTTP alternate / development servers | |
| TCP | http-alt | HTTP alternate (Chromecast) | |
| TCP | ajp13 | Apache JServ Protocol (Tomcat) | |
| TCP | http-alt | HTTP alternate / web proxies and app servers | |
| TCP | http-alt | HTTP alternate (Nexus, Airflow, dev) | |
| TCP | influxdb | InfluxDB HTTP API | |
| TCP | http-alt | Hadoop YARN ResourceManager / HTTP alternate | |
| TCP | https-alt | HTTPS alternate / admin consoles | |
| UDP | vxlan-linux | Linux VXLAN overlay | |
| TCP | mqtts | MQTT over TLS | |
| TCP | http-alt | Jupyter Notebook / HTTP alternate | |
| TCP | http-alt | PHP-FPM, SonarQube and Portainer | |
| TCP | tor-orport | Tor OR port / Supervisor | |
| TCP | cassandra | Apache Cassandra native transport | |
| TCP | http-alt | Prometheus / Cockpit web console | |
| TCP | kafka | Apache Kafka broker | |
| TCP | jetdirect | HP JetDirect printing / node exporter | |
| TCP | elasticsearch | Elasticsearch HTTP API | |
| TCP | elasticsearch | Elasticsearch transport layer | |
| TCP | git | Git protocol (git daemon) | |
| TCP | http-alt | Abyss web server / miscellaneous | |
| TCP | webmin | Webmin control panel / NDMP | |
| TCP | memcached | Memcached distributed cache | |
| UDP | memcached | Memcached distributed cache | |
| TCP | rabbitmq-mgmt | RabbitMQ management UI | |
| UDP | minecraft-bedrock | Minecraft Bedrock Edition | |
| TCP | minecraft | Minecraft Java Edition server | |
| TCP | mongodb | MongoDB database | |
| TCP | mongodb-shard | MongoDB shard server | |
| TCP | mongodb-config | MongoDB config server | |
| TCP | db2 | IBM DB2 database | |
| TCP | hdfs | Hadoop HDFS NameNode UI | |
| UDP | wireguard | WireGuard VPN |
Frequently asked questions
What are well-known ports?
Ports 0-1023 are reserved for common services such as HTTP (80), HTTPS (443), SSH (22) and DNS (53). Ports 1024-49151 are registered and 49152-65535 are dynamic ports used for temporary client connections.
What is the difference between TCP and UDP ports?
TCP is connection-oriented and reliable, which suits web, mail and file transfer traffic. UDP is connectionless and lower latency, used by DNS, DHCP, NTP and streaming. Many services listen on the same number on both protocols.
Can I use this to check if a port is open?
This tool explains what a port is normally used for but does not scan a host. To test reachability, combine the number with a connectivity or scan tool and only test systems you own or are authorised to test.
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