who uses this port?

[Charles Swiger]

On Nov 4, 2015, at 11:40 AM, Andriy Gapon <avg at FreeBSD.org> wrote:
> $ sockstat -l | fgrep 631
> ?        ?          ?     ?  tcp4   127.0.0.1:631         *:*
> 
> $ nc -l 127.0.0.1 631
> nc: Address already in use

That's the IPP port, commonly grabbed by CUPS and other printing software:

% grep 631 /etc/services | head -2
ipp	631/tcp		# Internet Printing Protocol
ipp	631/udp		# Internet Printing Protocol

Regards,
-- 
-Chuck