Port Reference
Comprehensive reference for network ports. Search or browse common TCP/UDP ports to find their associated services, protocols, and typical use cases. Essential for network administration and security.
Showing 43 ports
FTP-Data
FTP data transfer
FTP
FTP control (command)
SSH/SFTP
Secure Shell / Secure FTP
Telnet
Telnet (unencrypted remote access)
SMTP
Simple Mail Transfer Protocol
DNS
Domain Name System
DHCP
DHCP Server
DHCP
DHCP Client
TFTP
Trivial File Transfer Protocol
HTTP
Hypertext Transfer Protocol (unencrypted web)
POP3
Post Office Protocol v3
NTP
Network Time Protocol
IMAP
Internet Message Access Protocol
SNMP
Simple Network Management Protocol
LDAP
Lightweight Directory Access Protocol
HTTPS
HTTP Secure (encrypted web)
SMB
Server Message Block (Windows file sharing)
SMTPS
SMTP over SSL
Syslog
System logging
Submission
Mail submission (SMTP with STARTTLS)
LDAPS
LDAP over SSL
IMAPS
IMAP over SSL
POP3S
POP3 over SSL
OpenVPN
OpenVPN
MSSQL
Microsoft SQL Server
Oracle
Oracle database
ZooKeeper
Apache ZooKeeper
Dev Server
Common development server port (Node.js, React, etc.)
MySQL
MySQL database server
RDP
Remote Desktop Protocol (Windows)
Dev Server
Common development server port (Flask, etc.)
PostgreSQL
PostgreSQL database server
AMQP
RabbitMQ / AMQP messaging
VNC
Virtual Network Computing
Redis
Redis in-memory data store
HTTP-Alt
Alternative HTTP / development
HTTP-Alt
Alternative HTTP port, often used for proxies
HTTPS-Alt
Alternative HTTPS port
Various
PHP-FPM, SonarQube, etc.
Kafka
Apache Kafka
Elasticsearch
Elasticsearch REST API
Memcached
Memcached
MongoDB
MongoDB database server
Port Ranges
FAQ
What are well-known ports?
Well-known ports are 0-1023, assigned by IANA to common services. Examples: HTTP (80), HTTPS (443), SSH (22), FTP (21), SMTP (25), DNS (53). These typically require root/admin privileges.
What is the difference between TCP and UDP?
TCP provides reliable, ordered delivery with error checking and is used for HTTP, SSH, and email. UDP is faster but unreliable, used for DNS, streaming, and gaming where speed matters more than reliability.
What ports should I keep open on my firewall?
Only open ports for services you actively use. Common ports to consider: 80/443 for web servers, 22 for SSH, 25/587/993 for email. Always close unused ports to minimize security risks.