Port Checker Reference
Browse and search over 200 well-known TCP/UDP port numbers. Find any port by number or service name, filter by category (Web, Email, Database, Gaming, Security, File Transfer, Remote Access, and More), and see protocol details, descriptions, and IANA registration status. The complete port database runs entirely in your browser - no server calls, no signup, works offline.
251 ports found
Ports 0-1023 · Also includes common registered/high ports
Echo protocol - echoes back received data, historically used for testing and diagnostics.
Discard protocol - discards all received data, historically used for testing.
Daytime protocol - returns current date and time as a human-readable string.
Quote of the Day - returns a quote, historically used on UNIX systems.
Character Generator - generates a stream of characters for testing network throughput.
FTP data transfer port - used for the actual file data transfer in active FTP mode.
File Transfer Protocol - used for transferring files between client and server (control connection).
Secure Shell - encrypted remote login, command execution, and also supports file transfers via SFTP/SCP.
Secure Shell - encrypted remote login and command execution (primary remote admin tool).
Telnet - remote terminal access protocol (unencrypted, legacy - use SSH instead).
Simple Mail Transfer Protocol - used for sending email between mail servers (MTA-to-MTA).
Time Protocol - returns a 32-bit binary number representing seconds since 1900-01-01.
WHOIS protocol - used for querying domain name registration information.
Terminal Access Controller Access Control System - legacy authentication protocol for network devices.
Domain Name System - resolves domain names to IP addresses. UDP for queries, TCP for zone transfers.
Dynamic Host Configuration Protocol - server port for assigning IP addresses to clients automatically.
DHCP client port - used by client machines to receive IP configuration from DHCP servers.
Trivial File Transfer Protocol - lightweight file transfer without authentication, used for network booting and firmware updates.
Gopher protocol - early internet document retrieval protocol, predecessor to HTTP.
Finger protocol - returns information about system users, considered a security risk.
HyperText Transfer Protocol - serves web pages and API responses. The foundation of data communication on the World Wide Web.
Alternative HTTP port sometimes used for admin panels or secondary web servers.
Alternative HTTP port used for Toran Proxy or secondary web applications.
Kerberos authentication system - used by Active Directory and enterprise single sign-on.
Remote Telnet Service - legacy remote login service.
Post Office Protocol v2 - legacy email retrieval protocol, replaced by POP3.
Post Office Protocol v3 - downloads emails from a mail server to a local client, typically deleting from server.
Sun Remote Procedure Call - used by NFS and other ONC RPC services for port mapping.
Simple File Transfer Protocol - an older file transfer protocol, distinct from SSH-based SFTP.
Unix-to-Unix Copy Protocol - legacy system for file transfers between UNIX systems.
SQL Services - legacy SQL database service discovery protocol.
Network News Transfer Protocol - used for Usenet newsgroup discussions and distribution.
Network Time Protocol - synchronises computer clocks over a network to within milliseconds of UTC.
NetBIOS Name Service - legacy Windows NetBIOS name resolution.
NetBIOS Datagram Service - legacy Windows NetBIOS datagram transmission.
NetBIOS Session Service - legacy Windows file and printer sharing session establishment.
Internet Message Access Protocol - access emails on the mail server without downloading, supports server-side folders.
Simple Network Management Protocol - used to monitor and manage network devices (routers, switches, printers).
SNMP Trap - used by network devices to send unsolicited alerts to SNMP managers.
Border Gateway Protocol - core internet routing protocol used between autonomous systems.
Internet Relay Chat - text-based chat protocol for group communication and file sharing.
Lightweight Directory Access Protocol - used for querying and modifying directory services like Active Directory.
HTTP over TLS/SSL - encrypted web traffic for secure browsing, online banking, and e-commerce.
QUIC (HTTP/3) - modern encrypted transport protocol by Google, replacing TCP for web traffic.
Server Message Block - Windows file sharing, printer sharing, and named pipe communication.
SMTP over SSL/TLS - legacy secure SMTP port, still widely used by email providers.
Internet Key Exchange - used for IPsec VPN tunnel establishment and key management.
System Logging Protocol - used for sending log messages from network devices to a log server.
Apple Filing Protocol - legacy file sharing protocol used by macOS for network volumes.
SMTP Message Submission - used by email clients (MUA) to submit outgoing mail with authentication.
FileMaker Web Publishing - FileMaker Server admin console and web publishing.
LDAP over SSL/TLS - secure directory service queries for authentication and user data.
rsync daemon - used for efficient file synchronisation and backup transfers between systems.
FTP over TLS/SSL data channel - encrypted FTP data transfer.
FTP over TLS/SSL control channel - encrypted FTP control connection.
IMAP over SSL/TLS - secure email access with encryption.
IMAP over TLS/SSL - secure IMAP email access, also listed under email category.
POP3 over SSL/TLS - secure email retrieval with encryption.
OpenVPN - widely-used open-source VPN protocol. Also commonly uses TCP for fallback.
Default development server port for Hugo static site generator.
Microsoft SQL Server database - enterprise relational database by Microsoft.
Microsoft SQL Server Browser Service - responds to client requests for SQL Server instance information.
Oracle Database listener - default listener port for Oracle database connections.
Legacy RADIUS authentication port (before 1812 was standardised).
Legacy RADIUS accounting port (before 1813 was standardised).
Kermit file transfer protocol - legacy file transfer and terminal emulation protocol.
Generic tunnel port - sometimes used for L2TP or custom tunneling protocols.
Layer 2 Tunneling Protocol - used with IPsec for VPN connections.
Point-to-Point Tunneling Protocol - legacy VPN protocol by Microsoft, considered insecure.
RADIUS authentication protocol - used for network access authentication (WiFi, VPN).
RADIUS accounting protocol - used for tracking network resource usage.
Simple Service Discovery Protocol - used by UPnP devices for network discovery.
Cisco Skinny Client Control Protocol - used by Cisco VoIP phones for call control.
dCache Access Protocol - used for accessing dCache distributed storage system.
Network File System - allows remote file access over a network as if they were local files.
Command & Conquer online - used by C&C games for multiplayer matchmaking.
Apache ZooKeeper - distributed coordination service for distributed applications (Kafka, HBase).
Arma series game server - used by Arma 2/3 for multiplayer servers.
Docker REST API (unencrypted) - used for controlling Docker daemon via HTTP API.
Docker REST API over TLS - secure Docker daemon remote API.
Extended SMTP port sometimes used by email relay services and load balancers.
Alternative SMTP port used by some ISPs and hosting providers to bypass port 25 blocking.
Monit HTTP interface - process monitoring and system management web UI.
Default development port for React, Next.js, Gatsby, and many Node.js frameworks.
Grafana dashboard - default port for Grafana analytics and monitoring dashboards.
Grafana alternative port - used when primary port is occupied or for secondary instances.
Xbox Live - used by Xbox and Xbox 360 for multiplayer gaming, voice chat, and matchmaking.
Squid caching proxy - default port for the Squid HTTP/S proxy server.
Microsoft Global Catalog LDAP - searches across Active Directory forest.
Microsoft Global Catalog LDAP over SSL - secure global catalog searches.
MySQL database server - one of the most popular open-source relational databases.
Alternative MySQL port - sometimes used for MySQL slave connections or Galera cluster.
Remote Desktop Protocol - Microsoft remote desktop access for Windows machines.
Xbox Live STUN/TURN - used for NAT traversal and peer-to-peer connectivity on Xbox.
Session Traversal Utilities for NAT - used by WebRTC and VoIP for NAT traversal.
Xbox Live STUN/TURN secondary - additional Xbox network address translation port.
Steam Remote Play - used for streaming games from one computer to another.
Digital Audio Access Protocol - used by Apple iTunes for music sharing.
Node.js debugger - default port for Node.js built-in debugger and Chrome DevTools integration.
Apache Spark web UI - monitoring dashboard for Spark applications.
Teradici PCoIP - remote desktop protocol used by VMware Horizon View.
ManageSieve protocol for managing email filter rules on mail servers.
Default development port for Angular CLI applications.
Steam P2P UDP connection - used for Steam voice chat and P2P connectivity.
IPsec NAT Traversal - allows IPsec VPN traffic through NAT routers.
Logstash receiver - default port for Logstash event processing pipeline.
Sinatra default server - default port for Sinatra Ruby web applications.
DHCP failover communication - used between DHCP servers for high availability.
Jenkins CLI tunnel - used by Jenkins for master-agent communication via JNLP.
Steam In-Home Streaming - used for streaming games on local network.
GlassFish admin console - administration web UI for GlassFish application server.
Default port for Flask development server and many Docker registries.
Docker Registry HTTP - default port for Docker private container registry.
Docker Registry HTTPS - secure Docker private registry with TLS.
Logstash Beats input - default port for Elastic Beats (Filebeat, Metricbeat) to send data.
Mesos Marathon - cluster management framework for long-running services on Mesos.
Session Initiation Protocol - used for VoIP call signalling and instant messaging.
SIP over TLS - encrypted VoIP call signalling.
Default development port for Vite-based frameworks (Vue, Svelte, React).
XMPP client connection - Extensible Messaging and Presence Protocol (Jabber, Google Talk).
XMPP client over TLS - encrypted XMPP client connections.
XMPP server-to-server - federation between XMPP servers.
PostgreSQL Bi-Directional Replication port for multi-master replication setups.
TimescaleDB time-series database - typically uses PostgreSQL port or a custom port.
PostgreSQL database server - advanced open-source relational database with ACID compliance.
PgBouncer connection pool - PostgreSQL connection pooler, often uses same port as PostgreSQL.
VNC internal connection - used by some VNC servers for internal communication.
Android Debug Bridge - used for debugging Android devices over USB/WiFi.
Symantec pcAnywhere - legacy remote control software.
Symantec pcAnywhere status - legacy remote control status monitoring.
Advanced Message Queuing Protocol - used by RabbitMQ and other message brokers.
Node-Webkit debugger - debugger port for NW.js (node-webkit) applications.
Virtual Network Computing - remote desktop protocol allowing GUI access to remote machines.
VNC display :1 - first additional VNC display session.
VNC display :2 - second additional VNC display session.
Apache CouchDB database - NoSQL document database with RESTful HTTP API.
Blizzard Battle.net gaming platform - used by Warcraft III, StarCraft, Diablo, and World of Warcraft.
Blizzard Battle.net secondary port - used by older Blizzard games for chat and game listing.
Blizzard Battle.net tertiary port - used by Blizzard games for ladder and tournament data.
Redis key-value store and cache - in-memory data structure server used for caching, sessions, and pub/sub.
Redis Sentinel - monitoring port for Redis high-availability sentinel processes.
Kubernetes API server HTTPS - secure API endpoint for Kubernetes cluster management.
Kubernetes login port - used by some Kubernetes distributions for authentication.
MariaDB database server - a common alternative port for MariaDB (default mirrors MySQL on 3306).
Minecraft server query - used for querying Minecraft server status and player count.
Ceph monitor - distributed storage cluster monitoring and management port.
BitTorrent P2P - default range start for BitTorrent peer-to-peer file sharing transfers.
BitTorrent tracker - commonly used for BitTorrent tracker announcements.
Oracle WebLogic Server - default HTTP port for the WebLogic application server admin console.
Oracle WebLogic Server HTTPS - secure admin console port for WebLogic.
Apache Tomcat development port - sometimes used as alternative Tomcat port.
Apache Spark standalone master - cluster manager port for Spark applications.
Neo4j graph database - HTTP API port for the leading graph database.
Terraria game server - default port for running Terraria multiplayer servers.
Terraria UDP - used for Terraria server communication and world data.
Commonly used for development web servers, Django, Ruby on Rails, and Python http.server.
Apache Tomcat shutdown - used to send shutdown commands to Tomcat server.
Apache Tomcat AJP connector - used for Apache HTTPD reverse proxy integration with Tomcat.
Alternative HTTP port commonly used for web proxies, development servers (Tomcat, Jenkins), and caching proxies.
Jenkins CI server - default HTTP port for Jenkins continuous integration dashboard.
Sonatype Nexus repository - default HTTP port for Nexus artifact repository manager.
JFrog Artifactory - default port for the Artifactory binary repository manager.
SonarQube development port - used for SonarQube code quality analysis web UI.
SonarQube server - alternative port for SonarQube code quality platform.
InfluxDB HTTP API - time-series database port for data ingestion and queries.
Cockpit web console - browser-based server management interface for Linux.
Puppet agent - default port for Puppet configuration management agent communication.
ActiveMQ web console - administrative web UI for Apache ActiveMQ message broker.
Bitcoin network - peer-to-peer communication for Bitcoin blockchain transactions.
Alternative HTTPS port used for secure admin consoles, Tomcat SSL, and development environments.
Chia blockchain - peer-to-peer communication for Chia farming and trading.
HashiCorp Consul - service discovery and configuration for distributed systems.
Ethereum JSON-RPC API - default HTTP port for Ethereum node JSON-RPC interface.
Tiger Cache - used by some distributed caching and database systems.
Coda blockchain - peer-to-peer port for the Coda cryptocurrency protocol.
Jupyter Notebook - default port for Jupyter interactive computing notebooks.
PHP FastCGI Process Manager - commonly used for PHP application servers.
SonarQube web UI - default HTTP port for SonarQube code quality dashboard.
Supervisord web UI - process monitoring and control web interface.
Apache Cassandra native transport - distributed NoSQL database port for CQL queries.
Tor SOCKS proxy - default SOCKS5 proxy port for Tor anonymised traffic.
Prometheus metrics - default port for Prometheus monitoring and alerting toolkit.
Prometheus metrics alternative - used by Prometheus exporters for custom metrics.
Apache Kafka broker - distributed streaming platform port for message production and consumption.
Prometheus Alertmanager - handles alerts from Prometheus and sends notifications.
Prometheus Alertmanager cluster - inter-node communication for Alertmanager clustering.
Prometheus Node Exporter - hardware and OS metrics from Linux nodes.
Prometheus Nginx Exporter - built-in metrics endpoint for nginx-prometheus-exporter.
Prometheus WiFi Exporter - WiFi access point metrics exporter.
Prometheus Redis Exporter - Redis metrics for Prometheus monitoring.
Prometheus Kafka Exporter - Apache Kafka metrics exporter for Prometheus.
Cassandra JMX - Java Management Extensions for Cassandra monitoring and management.
Elasticsearch REST API - distributed search and analytics engine HTTP interface.
Elasticsearch inter-node transport - cluster communication between Elasticsearch nodes.
Splunk forwarder - used by Splunk heavy forwarders for data ingestion.
Git transport protocol - legacy Git smart transport protocol.
Kubernetes Dashboard HTTPS - secure port for the Kubernetes web UI dashboard.
OpenStack Neutron - networking service API port for OpenStack cloud.
HBase master UI - web interface for HBase distributed database master node.
Webmin system admin - web-based system administration interface for Linux servers.
Zabbix agent - monitoring agent for the Zabbix enterprise monitoring system.
Zabbix trapper - Zabbix server port for receiving data from trapper items.
MongoDB alternative - alternative port sometimes used by MongoDB shard servers.
Kubernetes kubelet API - used by the Kubernetes control plane to manage nodes.
Kubernetes kubelet read-only - read-only kubelet API for node status queries.
Kubernetes health check - liveness and readiness probe endpoint for Kubernetes.
Memcached distributed memory caching system - used for speeding up dynamic web applications.
Memcached alternative - alternative port for Memcached memory caching daemon.
Ollama LLM server - default port for running local LLM models via Ollama.
Kubernetes NodePort range start - start of the default NodePort range (30000-32767).
NetBus trojan - historically used by the NetBus remote administration trojan.
RabbitMQ management UI - web console for RabbitMQ message broker administration.
HBase region server UI - web interface for HBase region server status.
7 Days to Die game server - default server port for the zombie survival game.
Redis cluster bus - inter-node communication for Redis cluster deployment.
MongoDB config server - configuration server port for MongoDB sharded cluster.
MongoDB mongos router - query router port for MongoDB sharded cluster.
Minecraft Bedrock Edition IPv4 - server port for Minecraft Bedrock (Windows 10, mobile, console).
Minecraft Bedrock Edition IPv6 - IPv6 server port for Minecraft Bedrock Edition.
Distributed Network Protocol - used in SCADA and industrial control systems for utility automation.
NFS status monitoring - lock manager status monitoring for NFS.
NFS remote quota server - used for NFS disk quota reporting.
Kubernetes master alt - alternative port for Kubernetes API server.
Elasticsearch alternative - alternative port for Elasticsearch HTTP API.
Postfix TLS - Postfix mail server TLS submission port.
Minecraft Java Edition server - default port for Minecraft multiplayer servers.
Spigot/PaperMC - default port for Spigot and Paper Minecraft server implementations.
Steam master server - used by Steam client to query game server lists.
Steam game server (Source Engine) - used by Counter-Strike, Team Fortress 2, and other Source games.
Steam second game server port - used by Source games for additional game instances.
MongoDB database server - leading NoSQL document database.
Steam third game server port - additional Source game server instance port.
MongoDB shard server - port used by individual shards in a MongoDB cluster.
Steam P2P networking and streaming - used for Steam Remote Play and peer-to-peer connections.
Rust game server - default port for Rust multiplayer game server.
Kubernetes NodePort range end - end of the default NodePort range (30000-32767).
Back Orifice - historically used by the Back Orifice remote administration trojan.
Linux ephemeral port range start - dynamic/private ports used by client applications (varies by OS).
OxS file sync - used by some enterprise file synchronisation solutions.
SafetyNET p - real-time Ethernet protocol for industrial automation safety systems.
SAP System dispatcher - application server dispatcher port for SAP ERP and NetWeaver.
Hadoop HDFS NameNode web UI - default web interface for Hadoop NameNode status.
Hadoop HDFS DataNode web UI - web interface for Hadoop DataNode status.
Hadoop HDFS secondary NameNode - web UI for Hadoop secondary NameNode.
Kubernetes service range - within the Kubernetes service port range for LoadBalancer.
Deep Scan port - used by some network security scanning tools.
TeamViewer remote desktop - commonly used dynamic range falls around here.
Simple/Streaming Text Oriented Message Protocol - used by message brokers (ActiveMQ, RabbitMQ).
ActiveMQ WebSocket - WebSocket transport for ActiveMQ message broker.
Apache ActiveMQ - default port for ActiveMQ message broker OpenWire transport.
Maximum port number - theoretical maximum (2^16 - 1). Not usually assigned to any specific service.
Why Use Our Port Checker Reference?
Search by Port or Service
Quickly find any port by entering a number (e.g. 443) or a service name (e.g. HTTPS). Real-time filtering searches across port numbers, service names, and descriptions simultaneously - results update as you type.
Smart Category Filters
Browse ports by category - Web, Email, Database, File Transfer, Security, Remote Access, Gaming, and More. Each category groups related services so you can quickly understand which ports are used for what purpose.
Official & Unofficial Status
Each port shows its IANA registration status - official (assigned by IANA) or unofficial (commonly used but not registered). This helps distinguish between standards-compliant ports and de-facto industry conventions.
Comprehensive Port Database
Over 200 well-known ports (0-1023) fully documented with service names, protocols (TCP/UDP), descriptions, and categories. All data is bundled in the page - works offline with no external API calls.
Common Use Cases for Port Checker Reference
Security Auditing & Firewall Rules
Security professionals use the port reference to identify which services run on which ports when configuring firewall rules. Quickly look up whether port 3389 is RDP, 22 is SSH, or 3306 is MySQL to create precise allow/deny rules.
Server Configuration & Troubleshooting
System administrators configure web servers, mail servers, and databases daily. The port reference helps verify correct port assignments in nginx, Apache, Postfix, and other server software - no more guessing whether SMTP uses 25 or 587.
Network Diagnostics & Port Scanning
When running nmap, netstat, or lsof, the port reference helps interpret scan results. Identify what service might be running on an unfamiliar open port and determine whether it poses a security risk.
Web & Application Development
Developers building networked applications need to choose port numbers for their services. The reference shows which ports are officially assigned, which are commonly used unofficially, and which are available in the dynamic range.
IT Certification & Exam Preparation
CompTIA Network+, Security+, and CCNA exams test knowledge of common port numbers. Students use the reference to memorise which services run on ports 20/21 (FTP), 23 (Telnet), 25 (SMTP), 53 (DNS), 80 (HTTP), 443 (HTTPS), and more.
Tech Support & Troubleshooting Guides
Help desk technicians and support engineers use the port reference when guiding users through network configuration. Quickly explain why port 465 is for SMTPS or why port 993 is needed for IMAPS when setting up email clients.
Understanding the Port Checker Reference
What is a Port Checker Reference?
A port checker reference is a comprehensive lookup tool for TCP and UDP port numbers - the virtual endpoints that enable network communication. Every network service (web servers, email, databases, gaming) uses specific port numbers. Our port checker reference covers over 200 well-known ports (0-1023) with search, categories, and detailed descriptions - all running entirely in your browser with no external dependencies.
How Our Port Checker Reference Works
- Search or Browse:Start typing a port number (e.g. 443 for HTTPS) or a service name (e.g. "MySQL") in the search bar. The results filter in real-time across port numbers, service names, and descriptions.
- Filter by Category: Use the category buttons to focus on specific groups - Web, Email, Database, File Transfer, Security, Remote Access, Gaming, and More. Each category provides a curated view of related services.
- Review Port Details: Each entry shows the port number, protocol (TCP, UDP, or both), service name, description, and IANA registration status. Results include the total count and which category the port belongs to.
What Information the Port Checker Shows
- Port Number & Protocol: The numeric port (e.g. 22) and transport protocol (TCP, UDP, or SCTP). Many ports support multiple protocols.
- Service Name: The common service name assigned by IANA or widely adopted by the industry (e.g. SSH, HTTP, DNS, PostgreSQL).
- Description: A clear explanation of what the service does and how the port is used - from web browsing and email to database replication and gaming.
- Status Badge:Each port shows either "Official" (IANA assigned) or "Unofficial" (commonly used but not formally registered).
- Category Tag: Ports are tagged with their functional category for easy grouping - Web, Email, Database, File Transfer, Security, Remote Access, Gaming, or More.
Privacy & Data Handling
This port checker reference runs entirely in your browser with zero server-side processing. The entire port database of over 200 entries is bundled into the page, so there are no API calls, no data leaves your device, and the tool works even when you are offline. No search queries, filter selections, or usage patterns are sent anywhere. Your network configuration and browsing activity remain completely private.
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Frequently Asked Questions About Port Checker Reference
Well-known ports are port numbers from 0 to 1023 assigned by the Internet Assigned Numbers Authority (IANA) for specific services. They are reserved for widely-used protocols like HTTP (port 80), HTTPS (443), SSH (22), and DNS (53). Only system processes or programs run with administrator privileges can use these ports on most operating systems.
TCP (Transmission Control Protocol) is connection-oriented and guarantees delivery - it ensures data arrives in order and retransmits lost packets. UDP (User Datagram Protocol) is connectionless and faster but does not guarantee delivery. TCP is used for web browsing, email, and file transfers. UDP is used for DNS lookups, video streaming, online gaming, and VoIP where speed matters more than perfect reliability.
"Official" means the port number is formally assigned by IANA to a specific service and registered in the official Service Name and Transport Protocol Port Number Registry. "Unofficial" means the port is widely used by a particular application or service but is not formally registered with IANA. For example, port 3306 is unofficially but universally recognised as MySQL.
Some services use both TCP and UDP for different purposes. For example, DNS (port 53) uses UDP for standard lookups (fast, lightweight) and TCP for zone transfers (reliable, handles large responses). Some services like NTP (port 123) primarily use UDP, while others like SMTPS (port 465) only use TCP. When a port supports both, it is listed as TCP/UDP.
Many historically assigned ports are rarely used today (e.g., port 7 - Echo, port 9 - Discard). Others like port 80 (HTTP), 443 (HTTPS), 22 (SSH), and 53 (DNS) remain essential. Some ports have been reassigned over time as technologies evolved. This reference includes all 0-1023 IANA assignments, noting current usage where applicable.
When configuring a firewall, you need to know which ports to open for specific services. For example, to allow web traffic, open port 80 (HTTP) and 443 (HTTPS). For email delivery, open port 25 (SMTP). For remote administration, open port 22 (SSH). This reference helps you identify the correct ports by searching for the service name or browsing by category.
Ports 1024-49151 are called "registered ports." IANA assigns them to specific services upon request, but unlike well-known ports, they do not require system-level privileges. Many enterprise applications and database systems use registered ports (e.g., Microsoft SQL Server uses 1433, MongoDB uses 27017). Our reference focuses on the most commonly encountered registered ports alongside the 0-1023 well-known range.
This reference is regularly reviewed against the official IANA Service Name and Transport Protocol Port Number Registry. While we aim to keep it current, IANA assigns new ports periodically. For the most up-to-date official registry, visit the IANA website. Our database includes all historically significant ports and commonly referenced services.