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To: "freebsd-net@freebsd.org" <freebsd-net@FreeBSD.org>
From: Andriy Gapon <avg@FreeBSD.org>
Subject: who uses this port?
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Date: Wed, 4 Nov 2015 21:40:41 +0200
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$ sockstat -l | fgrep 631
?        ?          ?     ?  tcp4   127.0.0.1:631         *:*

$ nc -l 127.0.0.1 631
nc: Address already in use

-- 
Andriy Gapon