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Reserved — not assignable. Used for OS-level signaling.

File Transfer Protocol data channel for active mode transfers.

File Transfer Protocol command channel. Sends credentials in plain text.

Secure Shell — encrypted remote login, file transfer (SFTP/SCP), and tunneling.

Unencrypted remote terminal protocol. All data including passwords sent in cleartext.

Simple Mail Transfer Protocol — server-to-server email relay.

Domain Name System — resolves domain names to IP addresses.

Dynamic Host Configuration Protocol — server listens for client requests.

Dynamic Host Configuration Protocol — client receives IP configuration.

Trivial File Transfer Protocol — simple, unauthenticated file transfers.

Hypertext Transfer Protocol — unencrypted web traffic.

Network authentication protocol used in Active Directory environments.

Post Office Protocol v3 — retrieves email from server (unencrypted).

SunRPC portmapper — maps RPC program numbers to ports.

Network Time Protocol — clock synchronization across networks.

Microsoft RPC Endpoint Mapper. Gateway to Windows services.

NetBIOS Name Service — Windows network name resolution.

NetBIOS Datagram Service — Windows browser elections and announcements.

NetBIOS Session Service — file and printer sharing over NetBIOS.

Internet Message Access Protocol — email retrieval with server-side management.

Simple Network Management Protocol — monitor and manage network devices.

SNMP trap messages — asynchronous notifications from network devices.

Border Gateway Protocol — internet routing between autonomous systems.

Lightweight Directory Access Protocol — directory services (Active Directory).

HTTP over TLS — encrypted web traffic. The standard for secure websites.

Server Message Block — Windows file/printer sharing and AD communication.

Kerberos password change protocol.

SMTP over implicit TLS — encrypted email submission.

Internet Key Exchange — IPSec VPN tunnel negotiation.

System logging protocol — centralized log collection from network devices.

Apple Filing Protocol — macOS file sharing.

Email submission with STARTTLS — the recommended port for sending email.

Internet Printing Protocol / CUPS print server.

LDAP over SSL/TLS — encrypted directory services.

Encrypted DNS queries over TLS (DoT).

Rsync file synchronization daemon.

FTP over TLS — encrypted file transfer.

IMAP over SSL/TLS — encrypted email retrieval.

POP3 over SSL/TLS — encrypted email download.

SOCKS proxy protocol — application-level proxy routing.

OpenVPN — widely deployed open-source VPN solution.

Microsoft SQL Server default instance. Enterprise database.

SQL Server Browser service — resolves named instances to ports.

Oracle Database TNS Listener — default database connection port.

Point-to-Point Tunneling Protocol — legacy VPN. Broken encryption.

Remote Authentication Dial-In User Service — network access control.

RADIUS accounting — usage tracking for network access.

Message Queuing Telemetry Transport — lightweight IoT messaging protocol.

Simple Service Discovery Protocol for Universal Plug and Play.

Network File System — Unix/Linux network file sharing.

Apache ZooKeeper — distributed coordination service.

Docker daemon REST API without TLS. Grants root-level access.

Docker daemon REST API with TLS client authentication.

etcd client API — distributed key-value store used by Kubernetes.

Grafana dashboard default port. Also common for Node.js/React dev servers.

Squid web proxy cache default port.

MySQL and MariaDB database server default port.

Remote Desktop Protocol — Windows remote access.

NAT traversal for WebRTC and VoIP applications.

NATS messaging system — lightweight cloud-native messaging.

Erlang Port Mapper Daemon — service discovery for Erlang nodes.

IPSec NAT Traversal — VPN through NAT gateways.

HashiCorp Nomad HTTP API — workload orchestration.

Session Initiation Protocol — voice/video call signaling (VoIP).

SIP over TLS — encrypted VoIP signaling.

Extensible Messaging and Presence Protocol — real-time communication.

XMPP server-to-server federation protocol.

Multicast DNS — zero-configuration local network name resolution.

PostgreSQL database server default port.

RabbitMQ message broker — AMQP protocol.

Constrained Application Protocol — IoT web transfer protocol.

CoAP over DTLS — encrypted IoT communication.

Virtual Network Computing — remote desktop sharing.

VNC server display 1 (base 5900 + display number).

Apache CouchDB HTTP API — document-oriented NoSQL database.

Redis in-memory data store. Used as cache, message broker, and database.

Kubernetes API server — cluster management and orchestration.

IRC server common port range (6660-6669).

Internet Relay Chat — unencrypted real-time messaging.

IRC over TLS — encrypted real-time messaging.

Cassandra inter-node cluster communication.

Neo4j graph database browser and REST API.

Neo4j Bolt binary protocol for queries.

Common development server port (Django, Python HTTP).

Common alternative HTTP port. Used for proxies, dev servers, and admin panels.

Common port for Jenkins CI, application servers, and admin panels.

InfluxDB time-series database HTTP API.

Splunk REST API and management port.

ClickHouse column-oriented OLAP database HTTP interface.

HashiCorp Vault — secrets management and encryption.

Alternative HTTPS port. Common for admin UIs and application servers.

HashiCorp Consul HTTP API — service discovery and configuration.

Consul DNS interface for service discovery.

MQTT over TLS — encrypted IoT messaging.

Jupyter Notebook default port — interactive computing.

GitLab integrated Mattermost messaging port.

ClickHouse native TCP interface / also common for various apps.

Apache Cassandra CQL native transport — distributed NoSQL database.

Tor network SOCKS proxy for anonymous browsing.

Tor control port for managing the Tor daemon.

Prometheus monitoring server — metrics collection and alerting.

Apache Kafka distributed event streaming platform.

Elasticsearch HTTP API — search and analytics engine.

Elasticsearch internal cluster communication.

Git daemon protocol — unauthenticated read-only Git access.

Splunk universal forwarder data input.

Secure SNMP over DTLS — encrypted network management.

Kubelet API — node-level container management in Kubernetes.

Memcached distributed caching system.

RabbitMQ web management console.

Minecraft Java Edition server default port.

Valve Source engine game server (CS:GO, TF2, etc).

MongoDB NoSQL database default port.

MongoDB shard server (shardsvr) default port.

Plex Media Server web interface and streaming.

Tailscale WireGuard-based mesh VPN direct connections.

Jenkins JNLP agent communication port.

WireGuard VPN — modern, fast, cryptographically sound VPN tunnel.