Port 137 NetBios

used for file and printer sharing. port 137. Netbios name 16 characters. 15 chars define name and 16th character type of service

Netbios enumeration with NSE scripts

nmap -sV -v --script nbstat.nse 192.168.18.110

nmap -sU -p 137 --script nbstat.nse 192.168.18.110