Network Ports Database

25 TCP

SMTP

Email transmission between mail servers

110 TCP

POP3

Download email from server without encryption (POP3)

143 TCP

IMAP

Server-side email management without encryption (IMAP)

465 TCP

SMTPS

Encrypted email submission via implicit TLS (SMTPS)

587 TCP

SMTP-Submission

Authenticated email submission from client to mail server (STARTTLS)

993 TCP

IMAPS

Encrypted IMAP email access over TLS (IMAPS)

995 TCP

POP3S

Encrypted POP3 email retrieval over TLS (POP3S)

80 TCP

HTTP

Unencrypted web traffic (HTTP)

443 TCP

HTTPS

Encrypted web traffic (HTTPS / TLS)

5000 TCP

Flask

Flask development server or UPnP control port

8000 TCP

HTTP-alt

Alternate HTTP port for development servers

8080 TCP

HTTP-proxy

Alternate HTTP port — Tomcat, proxies, and application servers

8443 TCP

HTTPS-alt

Alternate HTTPS port for secondary services

43 TCP

WHOIS

Domain and IP registration information lookup (WHOIS)

53 BOTH

DNS

Resolves domain names to IP addresses (DNS)

5353 UDP

mDNS

Automatic local network device discovery (mDNS / Bonjour)

1433 TCP

MS-SQL

Microsoft SQL Server database

1434 UDP

MS-SQL-M

SQL Server Browser — instance discovery service

1521 TCP

Oracle

Oracle Database server (TNS Listener)

3306 TCP

MySQL

MySQL and MariaDB database server

5432 TCP

PostgreSQL

PostgreSQL relational database server

5984 TCP

CouchDB

Apache CouchDB document database with HTTP REST API

6379 TCP

Redis

Redis in-memory cache and data structure store

9200 TCP

Elasticsearch

Elasticsearch HTTP REST API for search and analytics

9300 TCP

Elasticsearch-cluster

Elasticsearch inter-node cluster communication

11211 BOTH

Memcached

Memcached distributed in-memory caching system

27017 TCP

MongoDB

MongoDB NoSQL document database

27018 TCP

MongoDB-shard

MongoDB shard server for horizontally scaled clusters

27019 TCP

MongoDB-config

MongoDB config server storing sharding metadata

22 TCP

SSH

Encrypted remote shell and file transfer (SSH)

23 TCP

Telnet

Obsolete unencrypted remote terminal protocol

3389 TCP

RDP

Windows Remote Desktop graphical remote access (RDP)

5900 TCP

VNC

Graphical remote desktop access (VNC)

20 TCP

FTP-DATA

FTP data transfer channel

21 TCP

FTP

FTP control channel for commands and responses

69 UDP

TFTP

Simple file transfer with no authentication (TFTP)

139 TCP

NetBIOS-SSN

Windows file sharing over NetBIOS (legacy SMB)

445 TCP

SMB

Windows file and printer sharing (SMB)

2049 BOTH

NFS

Shared filesystems between Unix/Linux systems (NFS)

6881 BOTH

BitTorrent

BitTorrent peer-to-peer file sharing

500 UDP

IKE

IPsec VPN key negotiation (IKE / IKEv2)

1194 UDP

OpenVPN

OpenVPN — widely used open-source VPN protocol

1701 UDP

L2TP

L2TP VPN tunneling protocol, typically combined with IPsec

1723 TCP

PPTP

PPTP VPN — legacy and cryptographically broken VPN protocol

4500 UDP

IKEv2-NAT-T

IPsec NAT traversal — allows IPsec through NAT routers

51820 UDP

WireGuard

WireGuard — modern, fast, and lean VPN protocol

161 UDP

SNMP

Monitoring and management of network devices (SNMP)

162 UDP

SNMPTRAP

SNMP trap receiver — unsolicited alerts from network devices

514 UDP

Syslog

Send system logs to a central log server (Syslog)

623 UDP

IPMI

IPMI out-of-band server hardware management

2082 TCP

cPanel

cPanel web hosting control panel without SSL

2083 TCP

cPanel-SSL

cPanel web hosting control panel with SSL (HTTPS)

2086 TCP

WHM

WHM server management panel without SSL

2087 TCP

WHM-SSL

WHM server management panel with SSL (HTTPS)

3000 TCP

Grafana

Grafana monitoring dashboards or Node.js development server

5601 TCP

Kibana

Kibana — visualization and search UI for Elasticsearch

6514 TCP

Syslog-TLS

Encrypted syslog transport over TLS

9090 TCP

Prometheus/Cockpit

Prometheus monitoring or Cockpit Linux web management

9100 TCP

Node-Exporter

Prometheus Node Exporter — exposes host system metrics

10000 TCP

Webmin

Webmin web-based Linux/Unix server administration

119 TCP

NNTP

Usenet newsgroup access (NNTP)

194 TCP

IRC

Real-time group chat protocol (IRC) — official IANA port

1883 TCP

MQTT

Lightweight publish-subscribe messaging for IoT devices (MQTT)

5672 TCP

AMQP

RabbitMQ message broker using the AMQP protocol

6667 TCP

IRC

IRC server standard port — unencrypted

6697 TCP

IRC-SSL

Encrypted IRC connections over SSL/TLS

8883 TCP

MQTT-TLS

MQTT over TLS — encrypted IoT messaging

9092 TCP

Kafka

Apache Kafka distributed event streaming platform

15672 TCP

RabbitMQ-mgmt

RabbitMQ Management Plugin web interface

2181 TCP

ZooKeeper

Apache ZooKeeper distributed coordination service

2375 TCP

Docker

Docker daemon API without encryption — extremely dangerous if exposed

2376 TCP

Docker-TLS

Docker daemon API secured with TLS

2379 TCP

etcd

etcd distributed key-value store — Kubernetes cluster state

3690 TCP

SVN

Apache Subversion (SVN) version control

6443 TCP

Kubernetes

Kubernetes API server — central cluster control plane

8888 TCP

Jupyter

Jupyter Notebook and JupyterLab interactive computing environment

9000 TCP

SonarQube

SonarQube code quality analysis or PHP-FPM FastCGI

9418 TCP

Git

Native Git protocol for unauthenticated repository access

67 UDP

DHCP

Automatic IP address assignment — DHCP server port

68 UDP

DHCP

DHCP client port — receives IP configuration from server

88 BOTH

Kerberos

Centralized ticket-based authentication (Kerberos)

111 BOTH

RPCBind

Maps RPC services to their dynamic ports (portmapper)

123 UDP

NTP

Network time synchronization (NTP)

135 TCP

MS-RPC

Microsoft RPC endpoint mapper — core Windows service

137 UDP

NetBIOS-NS

NetBIOS name resolution on Windows networks

138 UDP

NetBIOS-DGM

NetBIOS datagram broadcasts on Windows networks

179 TCP

BGP

Inter-ISP routing protocol that connects the internet (BGP)

389 BOTH

LDAP

Directory services for users and resources (LDAP / Active Directory)

631 TCP

IPP

Network printing via IPP and CUPS

636 TCP

LDAPS

Encrypted LDAP directory access over TLS (LDAPS)

1080 TCP

SOCKS

SOCKS proxy server for protocol-agnostic tunneling

3268 TCP

LDAP-GC

Active Directory Global Catalog over LDAP

3269 TCP

LDAP-GC-SSL

Active Directory Global Catalog over LDAPS (TLS)