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Date: Tue, 8 Sep 2020 08:04:53 +0200
From: Gian Piero Carrubba <gpiero@rm-rf.it>
To: freebsd-questions@freebsd.org
Subject: Re: what is cmd to show port listen on
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* [Tue, Sep 08, 2020 at 02:33:51AM +0200] wesley@magenta.de:
> I use “netstat -ntl”

Do you happen to have a non-standard netstat incarnation installed?  
Those parameters are fine on Linux (though you assumed OP only looked 
for TCP ports), but aren't recognized by the standard FreeBSD netstat.