Common Port Reference

Searchable list of well-known TCP and UDP port assignments.

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Well-known ports73 of 73

Well-known network ports with protocol, service, and description
Port	Protocol	Service	Description
20	TCP	FTP data	Active-mode FTP data channel.
21	TCP	FTP	File Transfer Protocol control channel. Plaintext.
22	TCP	SSH	Secure Shell; also carries SFTP and SCP.
23	TCP	Telnet	Unencrypted remote shell. Obsolete — use SSH.
25	TCP	SMTP	Mail transfer between servers. Often blocked outbound by ISPs.
53	TCP/UDP	DNS	Domain name resolution. UDP for queries, TCP for large answers and zone transfers.
67	UDP	DHCP server	DHCP server listens here for client requests.
68	UDP	DHCP client	DHCP client receives offers and acknowledgements here.
69	UDP	TFTP	Trivial FTP; used for network boot and device firmware.
80	TCP	HTTP	Unencrypted web traffic. Usually redirects to 443.
88	TCP/UDP	Kerberos	Kerberos key distribution centre authentication.
110	TCP	POP3	Mailbox retrieval, plaintext. See 995 for the TLS version.
111	TCP/UDP	rpcbind	ONC RPC portmapper; needed by classic NFS.
123	UDP	NTP	Network Time Protocol clock synchronisation.
135	TCP	MSRPC	Microsoft RPC endpoint mapper.
137	UDP	NetBIOS name	NetBIOS name service on legacy Windows networks.
139	TCP	NetBIOS session	SMB over NetBIOS; superseded by port 445.
143	TCP	IMAP	Mailbox access, plaintext. See 993 for the TLS version.
161	UDP	SNMP	Network device monitoring and polling.
162	UDP	SNMP trap	Asynchronous SNMP notifications sent to a manager.
194	TCP	IRC	Internet Relay Chat, plaintext.
389	TCP	LDAP	Directory access, plaintext or STARTTLS.
443	TCP	HTTPS	TLS-encrypted web traffic; also QUIC/HTTP-3 over UDP.
445	TCP	SMB	Windows file sharing over TCP. Never expose to the internet.
465	TCP	SMTPS	Mail submission wrapped in implicit TLS.
514	UDP	syslog	Classic remote logging. Unauthenticated and unencrypted.
587	TCP	SMTP submission	The standard port for clients submitting mail, with STARTTLS.
631	TCP	IPP / CUPS	Internet Printing Protocol and the CUPS web interface.
636	TCP	LDAPS	LDAP wrapped in implicit TLS.
873	TCP	rsync	rsync daemon protocol.
993	TCP	IMAPS	IMAP over implicit TLS.
995	TCP	POP3S	POP3 over implicit TLS.
1080	TCP	SOCKS proxy	SOCKS4/SOCKS5 proxy, including SSH dynamic forwarding.
1194	UDP	OpenVPN	OpenVPN default tunnel port.
1433	TCP	MS SQL Server	Microsoft SQL Server database engine.
1521	TCP	Oracle DB	Oracle database listener.
1723	TCP	PPTP	Legacy VPN protocol; cryptographically broken.
1883	TCP	MQTT	IoT publish/subscribe messaging, plaintext (8883 for TLS).
2049	TCP/UDP	NFS	Network File System server.
2181	TCP	ZooKeeper	Apache ZooKeeper client port.
2375	TCP	Docker API	Unencrypted Docker daemon API. Exposing this grants root.
2376	TCP	Docker API (TLS)	Docker daemon API with TLS client certificates.
3000	TCP	Dev server	Conventional local port for Node, Next.js, Rails, and Grafana.
3128	TCP	Squid proxy	Squid HTTP caching proxy default port.
3306	TCP	MySQL	MySQL and MariaDB database server.
3389	TCP	RDP	Windows Remote Desktop. A frequent brute-force target.
4200	TCP	Angular dev server	Default ng serve development port.
4369	TCP	epmd	Erlang port mapper; used by RabbitMQ and Elixir clusters.
5000	TCP	Flask / dev server	Flask default, and macOS AirPlay Receiver — a common clash.
5060	TCP/UDP	SIP	Session Initiation Protocol signalling for VoIP.
5173	TCP	Vite dev server	Vite default development server port.
5432	TCP	PostgreSQL	PostgreSQL database server.
5601	TCP	Kibana	Kibana web interface for Elasticsearch.
5672	TCP	AMQP	RabbitMQ and other AMQP 0-9-1 brokers.
5900	TCP	VNC	Remote framebuffer display :0; each display adds one.
5984	TCP	CouchDB	Apache CouchDB HTTP API.
6379	TCP	Redis	Redis server. Unauthenticated by default — bind to localhost.
6443	TCP	Kubernetes API	kube-apiserver secure port.
7000	TCP	Cassandra / AirPlay	Cassandra inter-node gossip; also macOS AirPlay.
8000	TCP	Dev / HTTP alt	Django, python -m http.server, and many local APIs.
8080	TCP	HTTP alternate	Tomcat, Jenkins, and proxies; the classic non-privileged HTTP port.
8086	TCP	InfluxDB	InfluxDB HTTP API.
8443	TCP	HTTPS alternate	TLS on a non-privileged port; common for admin consoles.
8883	TCP	MQTT over TLS	Encrypted MQTT.
9000	TCP	PHP-FPM / MinIO	PHP-FPM FastCGI, MinIO, SonarQube, and Portainer.
9090	TCP	Prometheus	Prometheus web UI and query API.
9092	TCP	Kafka	Apache Kafka broker listener.
9200	TCP	Elasticsearch HTTP	Elasticsearch and OpenSearch REST API.
9300	TCP	Elasticsearch transport	Node-to-node cluster transport (pre-8.x clusters).
11211	TCP/UDP	Memcached	Memcached cache. UDP has been abused for amplification attacks.
15672	TCP	RabbitMQ UI	RabbitMQ management plugin web interface.
27017	TCP	MongoDB	MongoDB database server.
50000	TCP	DB2 / SAP	IBM DB2 instance and SAP application server range.

This table is bundled with the page. Nothing is scanned, probed, or sent anywhere.

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About Common Port Reference

A searchable reference of well-known and commonly used ports — from 22/SSH and 443/HTTPS to database, mail, and container-ecosystem ports. Search by number or service name and see the protocol, default use, and security notes. Entirely offline; no scanning of any kind.

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