Kali Linux:An Ethical Hacker's Cookbook(Second Edition)
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Using Nmap to find open ports

Nmap or Network Mapper is a security scanner that was written by Gordon Lyon in September 1997. It is used to find hosts and services in a network. Nmap has various features and scripts that are designed to perform various tests, such as finding the OS, service version, and brute-force default logins.

The following are some of the most common types of scan:

  • TCP connect() scan
  • SYN stealth scan
  • UDP scan
  • Ping scan
  • Idle scan