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Searchable table of well-known TCP/UDP ports and the services behind them — the ports you actually meet in firewalls, security groups, and incident calls.
| Port | Proto | Service | Notes |
|---|---|---|---|
| 20 | TCP | FTP-data | FTP data transfer. |
| 21 | TCP | FTP | FTP control. |
| 22 | TCP | SSH | Secure shell, SCP, SFTP, git-over-ssh. |
| 23 | TCP | Telnet | Unencrypted remote shell — avoid. |
| 25 | TCP | SMTP | Mail transfer (often blocked outbound). |
| 53 | TCP/UDP | DNS | Name resolution; UDP normally, TCP for large/zone transfers. |
| 67 | UDP | DHCP server | DHCP server. |
| 68 | UDP | DHCP client | DHCP client. |
| 80 | TCP | HTTP | Plain web traffic. |
| 110 | TCP | POP3 | Mail retrieval (legacy). |
| 123 | UDP | NTP | Time sync — clock skew breaks TLS/mTLS/tokens. |
| 143 | TCP | IMAP | Mail retrieval. |
| 161 | UDP | SNMP | Network device monitoring. |
| 179 | TCP | BGP | Border Gateway Protocol (routing). |
| 389 | TCP | LDAP | Directory services (AD/OpenLDAP). |
| 443 | TCP | HTTPS | TLS web traffic; also HTTP/2, gRPC, many APIs. |
| 465 | TCP | SMTPS | SMTP over TLS. |
| 514 | UDP | Syslog | Log shipping. |
| 587 | TCP | SMTP submission | Authenticated mail submission (STARTTLS). |
| 636 | TCP | LDAPS | LDAP over TLS. |
| 873 | TCP | rsync | rsync daemon. |
| 989 | TCP | FTPS-data | FTP data over TLS. |
| 990 | TCP | FTPS | FTP control over TLS. |
| 993 | TCP | IMAPS | IMAP over TLS. |
| 995 | TCP | POP3S | POP3 over TLS. |
| 1080 | TCP | SOCKS proxy | SOCKS proxy. |
| 1433 | TCP | MS SQL Server | Microsoft SQL Server. |
| 1521 | TCP | Oracle DB | Oracle database listener. |
| 2049 | TCP | NFS | Network File System. |
| 2181 | TCP | ZooKeeper | ZooKeeper client port. |
| 2379 | TCP | etcd client | etcd client API (Kubernetes control plane). |
| 2380 | TCP | etcd peer | etcd peer communication. |
| 3000 | TCP | Grafana / dev | Grafana default; common Node/dev-server port. |
| 3306 | TCP | MySQL | MySQL / MariaDB. |
| 3389 | TCP | RDP | Windows Remote Desktop. |
| 4317 | TCP | OTLP gRPC | OpenTelemetry OTLP over gRPC. |
| 4318 | TCP | OTLP HTTP | OpenTelemetry OTLP over HTTP. |
| 5000 | TCP | Registry / dev | Docker registry; common dev-server port. |
| 5432 | TCP | PostgreSQL | PostgreSQL. |
| 5601 | TCP | Kibana | Kibana / OpenSearch Dashboards. |
| 5672 | TCP | AMQP | RabbitMQ / AMQP. |
| 6379 | TCP | Redis | Redis. |
| 6443 | TCP | Kubernetes API | kube-apiserver HTTPS. |
| 8080 | TCP | HTTP-alt | Alt HTTP; app servers, proxies, ingress backends. |
| 8443 | TCP | HTTPS-alt | Alt HTTPS; admin/consoles. |
| 9000 | TCP | SonarQube / MinIO | SonarQube, MinIO, php-fpm. |
| 9090 | TCP | Prometheus | Prometheus server. |
| 9093 | TCP | Alertmanager | Prometheus Alertmanager. |
| 9100 | TCP | node_exporter | Prometheus node_exporter metrics. |
| 9200 | TCP | Elasticsearch | Elasticsearch / OpenSearch HTTP. |
| 9092 | TCP | Kafka | Kafka broker. |
| 9411 | TCP | Zipkin | Zipkin trace collector. |
| 10250 | TCP | kubelet | Kubelet API on each node. |
| 15672 | TCP | RabbitMQ UI | RabbitMQ management UI. |
| 27017 | TCP | MongoDB | MongoDB. |