nmap
A network scanner that finds which hosts are up and which ports and services they expose.
In more detail
Defenders use it to check that only intended ports are open; scanning networks you do not own without permission can be illegal. nmap -sT host lists open TCP ports, and -sV guesses the service behind each.
Related terms
- netcat — A small tool that opens or listens on network connections, used to test whether a port answers.
Taught in
- A Server Nobody Can Find: Addresses, Routes And Names On Both Families — CompTIA Linux+ (XK0-006) Exam Prep
- What Changed Last Night? Integrity, Scans, Benchmarks And Secure Deletion — CompTIA Linux+ (XK0-006) Exam Prep
- Security Rounds: Special Bits, Logins, Ports And sudo — LPIC-1 Linux Administrator (101-500 and 102-500) Exam Prep