Find which service uses a TCP or UDP port, with security notes for exposing it to the internet.
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20 FTP data
TCP · FTP active-mode data transfer.
high risk
21 FTP
TCP · File Transfer Protocol control channel.
high risk
22 SSH / SFTP
TCP · Secure Shell remote login, SFTP and SCP.
medium risk
23 Telnet
TCP · Unencrypted remote terminal.
high risk
25 SMTP
TCP · Mail transfer between servers.
medium risk
53 DNS
TCP/UDP · Domain Name System queries.
medium risk
67 DHCP server
UDP · DHCP server listens here for client requests.
low risk
68 DHCP client
UDP · DHCP client receives offers here.
low risk
69 TFTP
UDP · Trivial File Transfer Protocol, used for PXE boot and network devices.
high risk
80 HTTP
TCP · Unencrypted web traffic.
low risk
110 POP3
TCP · Post Office Protocol mail retrieval.
medium risk
123 NTP
UDP · Network Time Protocol.
medium risk
135 MS RPC
TCP · Microsoft RPC endpoint mapper.
high risk
137 NetBIOS name
UDP · NetBIOS name service.
high risk
139 NetBIOS session
TCP · NetBIOS session service (old SMB).
high risk
143 IMAP
TCP · Internet Message Access Protocol.
medium risk
161 SNMP
UDP · Simple Network Management Protocol polling.
high risk
389 LDAP
TCP/UDP · Lightweight Directory Access Protocol.
high risk
443 HTTPS
TCP/UDP · HTTP over TLS. UDP 443 carries HTTP/3 (QUIC).
low risk
445 SMB
TCP · Windows file sharing (Server Message Block).
high risk
465 SMTPS
TCP · SMTP submission over implicit TLS.
low risk
514 Syslog
UDP · Remote syslog.
medium risk
587 SMTP submission
TCP · Mail submission with STARTTLS.
low risk
636 LDAPS
TCP · LDAP over TLS.
medium risk
873 rsync daemon
TCP · rsync in daemon mode.
high risk
993 IMAPS
TCP · IMAP over TLS.
low risk
995 POP3S
TCP · POP3 over TLS.
low risk
1194 OpenVPN
UDP/TCP · OpenVPN default port.
low risk
1433 Microsoft SQL Server
TCP · MS SQL Server database.
high risk
1521 Oracle DB
TCP · Oracle database listener.
high risk
1883 MQTT
TCP · MQTT message broker (plain).
high risk
2049 NFS
TCP/UDP · Network File System.
high risk
2375 Docker API (plain)
TCP · Docker daemon API without TLS.
high risk
2376 Docker API (TLS)
TCP · Docker daemon API with TLS.
high risk
2379 etcd client
TCP · etcd key-value store client API (Kubernetes state).
high risk
3000 Dev servers / Grafana
TCP · Common default for Node.js dev servers and Grafana.
medium risk
3306 MySQL / MariaDB
TCP · MySQL and MariaDB database server.
high risk
3389 RDP
TCP/UDP · Windows Remote Desktop.
high risk
5000 Flask / Docker registry
TCP · Common default for Flask dev server and Docker registry. Also AirPlay on macOS.
medium risk
5060 SIP
TCP/UDP · Session Initiation Protocol (VoIP).
high risk
5432 PostgreSQL
TCP · PostgreSQL database server.
high risk
5672 RabbitMQ (AMQP)
TCP · AMQP message broker.
high risk
5900 VNC
TCP · Virtual Network Computing remote desktop.
high risk
6379 Redis
TCP · Redis in-memory data store.
high risk
6443 Kubernetes API
TCP · Kubernetes API server.
high risk
8080 HTTP alternate
TCP · Alternate HTTP port for proxies, Tomcat, Jenkins and dev servers.
medium risk
8443 HTTPS alternate
TCP · Alternate HTTPS port, often admin panels.
medium risk
9000 PHP-FPM / SonarQube / MinIO
TCP · PHP-FPM FastCGI default, also SonarQube and MinIO.
high risk
9090 Prometheus
TCP · Prometheus server web UI and API.
medium risk
9100 Node Exporter
TCP · Prometheus node_exporter metrics.
medium risk
9200 Elasticsearch
TCP · Elasticsearch REST API.
high risk
9300 Elasticsearch transport
TCP · Elasticsearch node-to-node communication.
high risk
10250 Kubelet API
TCP · Kubernetes kubelet API.
high risk
11211 Memcached
TCP/UDP · Memcached cache.
high risk
27017 MongoDB
TCP · MongoDB database server.
high risk
51820 WireGuard
UDP · WireGuard VPN default port.
low risk
Not in our list yet — check /etc/services on any Linux box.
sudo ss -tulpn # all listening TCP/UDP sockets with process
sudo lsof -i :8080 # which process owns port 8080"Risk" is how dangerous it usually is to expose the service directly to the internet. Databases, caches and management APIs should live on private networks or behind a VPN.