Ports

Application Ports

Difference between Ports

• Hardware port: Refers to the physical interface where a cable must be connected.
• Software port: A point of entry for communication using a specific protocol.

The software port is also called an application port because it matches a 16-bit coded number (ranging from 1 to 65536) with an application.

Common Network Ports

• Port 0 to 1023 are standardized

• 20 TCP – FTP Data: File transfer

• 21 TCP – FTP Control: File transfer commands

• 22 TCP – SSH: Secure remote login

• 23 TCP – Telnet: Unencrypted remote login

• 25 TCP – SMTP: Sending email

• 53 TCP/UDP – DNS: Domain Name System

• 67 UDP – DHCP Server: Assign IP addresses

• 68 UDP – DHCP Client: Request IP addresses

• 69 UDP – TFTP: Trivial File Transfer Protocol

• 80 TCP/UDP – HTTP: Web traffic

• 110 TCP – POP3: Email retrieval

• 123 UDP – NTP: Network Time Protocol (clock sync)

• 139 TCP – NetBIOS Session Service: Windows file sharing

• 143 TCP – IMAP: Email retrieval

• 389 TCP/UDP – LDAP: Directory services

• 443 TCP/UDP – HTTPS: Secure web traffic

• 587 TCP – SMTP Submission

• 993 TCP – IMAPS: IMAP over SSL/TLS

• 995 TCP – POP3S: POP3 over SSL/TLS

• 3306 TCP – MySQL / MariaDB

• 3389 TCP – RDP: Remote Desktop Protocol

• 5432 TCP – PostgreSQL

• 5900 TCP – VNC: Remote desktop protocol

• 6000–6007 TCP – X11 Display Server (graphical interface)

• 6379 TCP – Redis

• 8080 TCP – HTTP Alternate / Proxy

• 27017 TCP – MongoDB