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I would like to stop others from using Nmap to scanning my Mac.
How can I do that ?

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    Blocking nmap is like forbidding everyone to check whether your doors and windows at home are locked. Better to make sure that they are actually locked. – nohillside Nov 30 '20 at 11:58
  • Welcome to Ask Different. You can prevent some Nmap probes (ICMP probes, to be specific) by enabling stealth mode in System Preferences > Security & Privacy > Firewall > Firewall Options... – jaume Nov 30 '20 at 13:04
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The nmap tool is tricky and designed to evade firewalls, so you might need a hardware firewall or assistance from a network administrator based on how skilled the operator of nmap is.

You can’t be on a network and remain totally invisible.

That being said, enabling the firewall and configuring it to drop incoming connections is usually good enough.

Be sure to go into advanced and choose Block all incoming connections

This breaks many functions for sharing out, which is precisely what nmap detects.

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