Port Reference: Use Cases for System Administrators

Port Reference Use Cases

Firewall Configuration

When configuring iptables, ufw, or Windows Firewall, you need to know which ports to open for each service. The reference provides a quick answer.

Connection Diagnostics

Docker and Microservices Setup

When containerizing, you need to map container ports to the host. The reference helps avoid conflicts between services.

NAT and Port Forwarding Setup

To access a home server from outside, you need to forward ports on your router. The reference suggests the correct port numbers.

Security Auditing

Port scanning is the first step of a pentest. Knowing the standard service ports, an auditor quickly identifies running software and its versions.

Training and Exam Preparation

Knowledge of key ports (22, 53, 80, 443, 3389) is a mandatory requirement for CompTIA, Cisco, and other vendor certifications.

Find the port you need in the Port List.

See also: IP Calculator, Subnet Calculator