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Port Reference
Web(7)
| Port | Protocol | Service | Description |
|---|---|---|---|
| 80 | TCP | HTTP | Hypertext Transfer Protocol - web traffic. |
| 443 | TCP | HTTPS | HTTP over TLS/SSL - encrypted web traffic. |
| 8080 | TCP | HTTP-Alt | Alternative HTTP port, often used for proxies and dev servers. |
| 8443 | TCP | HTTPS-Alt | Alternative HTTPS port. |
| 8000 | TCP | HTTP-Alt | Commonly used for development web servers. |
| 3000 | TCP | Dev Server | Common port for Node.js/React dev servers. |
| 5000 | TCP | Dev Server | Common port for Python Flask and other frameworks. |
File Transfer(6)
| Port | Protocol | Service | Description |
|---|---|---|---|
| 20 | TCP | FTP-Data | File Transfer Protocol - data transfer channel. |
| 21 | TCP | FTP | File Transfer Protocol - control channel. |
| 69 | UDP | TFTP | Trivial File Transfer Protocol, used for booting devices. |
| 989 | TCP | FTPS-Data | FTP over TLS/SSL - data channel. |
| 990 | TCP | FTPS | FTP over TLS/SSL - control channel. |
| 115 | TCP | SFTP | Simple File Transfer Protocol (not SSH-based). |
Email(7)
| Port | Protocol | Service | Description |
|---|---|---|---|
| 25 | TCP | SMTP | Simple Mail Transfer Protocol - outgoing mail. |
| 465 | TCP | SMTPS | SMTP over TLS/SSL. |
| 587 | TCP | SMTP-Submit | SMTP with STARTTLS, used for mail submission. |
| 110 | TCP | POP3 | Post Office Protocol v3 - incoming mail retrieval. |
| 995 | TCP | POP3S | POP3 over TLS/SSL. |
| 143 | TCP | IMAP | Internet Message Access Protocol - incoming mail. |
| 993 | TCP | IMAPS | IMAP over TLS/SSL. |
Remote Access(5)
| Port | Protocol | Service | Description |
|---|---|---|---|
| 22 | TCP | SSH | Secure Shell - encrypted remote terminal access. |
| 23 | TCP | Telnet | Unencrypted remote terminal access (legacy). |
| 3389 | TCP | RDP | Remote Desktop Protocol - Windows remote desktop. |
| 5900 | TCP | VNC | Virtual Network Computing - remote desktop sharing. |
| 5901 | TCP | VNC-1 | VNC display :1 (commonly used). |
Database(9)
| Port | Protocol | Service | Description |
|---|---|---|---|
| 3306 | TCP | MySQL | MySQL database server. |
| 5432 | TCP | PostgreSQL | PostgreSQL database server. |
| 27017 | TCP | MongoDB | MongoDB database server. |
| 6379 | TCP | Redis | Redis key-value data store. |
| 1433 | TCP | MSSQL | Microsoft SQL Server. |
| 1521 | TCP | Oracle DB | Oracle database default listener port. |
| 9042 | TCP | Cassandra | Apache Cassandra native transport. |
| 9200 | TCP | Elasticsearch | Elasticsearch REST API. |
| 8086 | TCP | InfluxDB | InfluxDB HTTP API. |
Directory & Auth(4)
| Port | Protocol | Service | Description |
|---|---|---|---|
| 389 | TCP | LDAP | Lightweight Directory Access Protocol. |
| 636 | TCP | LDAPS | LDAP over TLS/SSL. |
| 1812 | UDP | RADIUS-Auth | RADIUS authentication protocol. |
| 1813 | UDP | RADIUS-Acct | RADIUS accounting protocol. |
Network Infrastructure(9)
| Port | Protocol | Service | Description |
|---|---|---|---|
| 53 | TCP/UDP | DNS | Domain Name System - resolves domain names to IPs. |
| 67 | UDP | DHCP-Server | Dynamic Host Configuration Protocol - server. |
| 68 | UDP | DHCP-Client | Dynamic Host Configuration Protocol - client. |
| 123 | UDP | NTP | Network Time Protocol - clock synchronization. |
| 161 | UDP | SNMP | Simple Network Management Protocol - monitoring. |
| 162 | UDP | SNMP-Trap | SNMP trap notifications. |
| 179 | TCP | BGP | Border Gateway Protocol - core internet routing. |
| 514 | UDP | Syslog | System logging protocol. |
| 1900 | UDP | UPnP-SSDP | Simple Service Discovery Protocol (UPnP). |
Messaging & Streaming(5)
| Port | Protocol | Service | Description |
|---|---|---|---|
| 1883 | TCP | MQTT | MQ Telemetry Transport - IoT messaging. |
| 8883 | TCP | MQTTS | MQTT over TLS/SSL. |
| 5672 | TCP | AMQP | Advanced Message Queuing Protocol (RabbitMQ). |
| 1935 | TCP | RTMP | Real-Time Messaging Protocol (streaming). |
| 554 | TCP | RTSP | Real Time Streaming Protocol. |
Container & Orchestration(4)
| Port | Protocol | Service | Description |
|---|---|---|---|
| 2375 | TCP | Docker-API | Docker REST API (unencrypted). |
| 2376 | TCP | Docker-API-TLS | Docker REST API (TLS). |
| 6443 | TCP | K8s-API | Kubernetes API server. |
| 8444 | TCP | K8s-Dashboard | Kubernetes web UI dashboard. |