ByteByteGo Logo
Coding
Networking Ports

18 Common Ports Worth Knowing

Learn about 18 common network ports and their uses.

Edit on GitHub

  • FTP (File Transfer Protocol): Uses TCP Port 21
  • SSH (Secure Shell for Login): Uses TCP Port 22
  • Telnet: Uses TCP Port 23 for remote login
  • SMTP (Simple Mail Transfer Protocol): Uses TCP Port 25
  • DNS: Uses UDP or TCP on Port 53 for DNS queries
  • DHCP Server: Uses UDP Port 67
  • DHCP Client: Uses UDP Port 68
  • HTTP (Hypertext Transfer Protocol): Uses TCP Port 80
  • POP3 (Post Office Protocol V3): Uses TCP Port 110
  • NTP (Network Time Protocol): Uses UDP Port 123
  • NetBIOS: Uses TCP Port 139 for NetBIOS service
  • IMAP (Internet Message Access Protocol): Uses TCP Port 143
  • HTTPS (Secure HTTP): Uses TCP Port 443
  • SMB (Server Message Block): Uses TCP Port 445
  • Oracle DB: Uses TCP Port 1521 for Oracle database communication port
  • MySQL: Uses TCP Port 3306 for MySQL database communication port
  • RDP: Uses TCP Port 3389 for Remote Desktop Protocol
  • PostgreSQL: Uses TCP Port 5432 for PostgreSQL database communication

Related Guides

API and Web Development

The Evolving Landscape of API Protocols in 2023

API and Web Development

The Ultimate API Learning Roadmap

API and Web Development

REST API Cheatsheet

API and Web Development

What is GraphQL?

API and Web Development

REST API vs. GraphQL

API and Web Development

Explaining 9 Types of API Testing

API and Web Development