| Port | Protocol | Service | Category | Description | |
|---|---|---|---|---|---|
| 20 | TCP | FTP | Well-known | File Transfer Protocol — data transfer | |
| 21 | TCP | FTP | Well-known | File Transfer Protocol — control | |
| 22 | TCP | SSH | Well-known | Secure Shell — encrypted remote login and tunneling | |
| 23 | TCP | Telnet | Well-known | Telnet — unencrypted remote terminal (legacy) | |
| 25 | TCP | SMTP | Well-known | Simple Mail Transfer Protocol — email sending | |
| 53 | TCP/UDP | DNS | Well-known | Domain Name System — hostname to IP resolution | |
| 67 | UDP | DHCP | Well-known | Dynamic Host Configuration Protocol — server | |
| 68 | UDP | DHCP | Well-known | Dynamic Host Configuration Protocol — client | |
| 69 | UDP | TFTP | Well-known | Trivial File Transfer Protocol | |
| 80 | TCP | HTTP | Well-known | Hypertext Transfer Protocol — unencrypted web traffic | |
| 110 | TCP | POP3 | Well-known | Post Office Protocol v3 — email retrieval | |
| 119 | TCP | NNTP | Well-known | Network News Transfer Protocol | |
| 123 | UDP | NTP | Well-known | Network Time Protocol — clock synchronization | |
| 143 | TCP | IMAP | Well-known | Internet Message Access Protocol — email retrieval | |
| 161 | UDP | SNMP | Well-known | Simple Network Management Protocol | |
| 194 | TCP | IRC | Well-known | Internet Relay Chat | |
| 389 | TCP/UDP | LDAP | Well-known | Lightweight Directory Access Protocol | |
| 443 | TCP | HTTPS | Well-known | HTTP Secure — encrypted web traffic (TLS) | |
| 445 | TCP | SMB | Well-known | Server Message Block — Windows file sharing | |
| 465 | TCP | SMTPS | Well-known | SMTP over TLS — secure email sending | |
| 514 | UDP | Syslog | Well-known | System Logging Protocol | |
| 587 | TCP | SMTP | Well-known | SMTP submission — email sending (STARTTLS) | |
| 636 | TCP | LDAPS | Well-known | LDAP over TLS | |
| 993 | TCP | IMAPS | Well-known | IMAP over TLS — secure email retrieval | |
| 995 | TCP | POP3S | Well-known | POP3 over TLS | |
| 1080 | TCP | SOCKS | Registered | SOCKS proxy protocol | |
| 1194 | TCP/UDP | OpenVPN | Registered | OpenVPN | |
| 1433 | TCP | MSSQL | Registered | Microsoft SQL Server database | |
| 1521 | TCP | Oracle DB | Registered | Oracle Database default listener | |
| 1883 | TCP | MQTT | Registered | Message Queuing Telemetry Transport (IoT) | |
| 2181 | TCP | ZooKeeper | Registered | Apache ZooKeeper client port | |
| 2375 | TCP | Docker | Registered | Docker daemon API (unencrypted) | |
| 2376 | TCP | Docker | Registered | Docker daemon API (TLS) | |
| 3000 | TCP | Dev Server | Registered | Common dev server port (React, Next.js, etc.) | |
| 3306 | TCP | MySQL | Registered | MySQL and MariaDB database | |
| 3389 | TCP | RDP | Registered | Remote Desktop Protocol — Windows | |
| 4200 | TCP | Angular | Registered | Angular CLI dev server default | |
| 4443 | TCP | HTTPS Alt | Registered | Alternate HTTPS port | |
| 5000 | TCP | Flask / UPnP | Registered | Flask dev server / UPnP | |
| 5432 | TCP | PostgreSQL | Registered | PostgreSQL database | |
| 5601 | TCP | Kibana | Registered | Kibana web interface (ELK stack) | |
| 5672 | TCP | RabbitMQ | Registered | RabbitMQ AMQP messaging | |
| 5900 | TCP | VNC | Registered | Virtual Network Computing remote desktop | |
| 6379 | TCP | Redis | Registered | Redis key-value data store | |
| 6443 | TCP | Kubernetes | Registered | Kubernetes API server | |
| 7700 | TCP | Meilisearch | Registered | Meilisearch search engine | |
| 8000 | TCP | HTTP Alt | Registered | Common alternative HTTP / Django dev server | |
| 8080 | TCP | HTTP Alt | Registered | Common HTTP proxy / Tomcat / Spring Boot | |
| 8086 | TCP | InfluxDB | Registered | InfluxDB time-series database HTTP API | |
| 8443 | TCP | HTTPS Alt | Registered | Common alternative HTTPS port | |
| 8888 | TCP | Jupyter | Registered | Jupyter Notebook web interface | |
| 9000 | TCP | PHP-FPM | Registered | PHP-FPM / SonarQube / MinIO API | |
| 9090 | TCP | Prometheus | Registered | Prometheus metrics server | |
| 9092 | TCP | Kafka | Registered | Apache Kafka broker | |
| 9200 | TCP | Elasticsearch | Registered | Elasticsearch REST API | |
| 9300 | TCP | Elasticsearch | Registered | Elasticsearch inter-node communication | |
| 9418 | TCP | Git | Registered | Git protocol | |
| 10250 | TCP | Kubelet | Registered | Kubernetes Kubelet API | |
| 15672 | TCP | RabbitMQ | Registered | RabbitMQ management web UI | |
| 27017 | TCP | MongoDB | Registered | MongoDB document database | |
| 50051 | TCP | gRPC | Registered | gRPC default port |
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