Everyone in the security community who has something to do with security testing has used this wonderful tool known as "Nmap", but is Nmap the best port scanner available ?
Recently, I was engaged in a penetration testing assignment, I was using Nmap for scanning ports but the results I was getting from Nmap and a Free Online Scanner were different.
The free online scanner was giving out more results which I could validate using different scripts from different places.
I found that Nmap,is lacking behind in terms of "Scripts".
The Scripts database hasn't been updated from a long time.
so, the next time you are making a port-scan just consider using other port-scanners as well to get better results.