description
Network Basic Input/Output System (Net-BIOS)

🔥 137, 138, 139/Net-BIOS

General Information

Name service for registration operates on 137.
Connection-less communication operates on 138.
Session service for connection-oriented communication operates on port 139.

Enumerating a NetBIOS service:

nbtscan <IP>/30

sudo nmap -sU -sV -T4 --script nbstat.nse -p137 -Pn -n <IP>

Tools

nmap

nbtscan