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I'm working an issue with ZeroMQ using XSub-XPub. I did lsof on bind in port and see:

lsof -i :5556 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME python 475590 codespace 45u IPv4 1432077 0t0 TCP localhost:51620->localhost:freeciv (ESTABLISHED) python 475684 codespace 12u IPv4 1421144 0t0 TCP *:freeciv (LISTEN) python 475684 codespace 15u IPv4 1430650 0t0 TCP localhost:freeciv->localhost:51620 (ESTABLISHED)

What is freeciv?

Search only yields a video game, but it's not that.

Ubuntu 20.04.6.

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lsof tries to match port with a service name specified in /etc/services:

$ grep freeciv /etc/services freeciv 5556/tcp rptp # Freeciv gameplay

Use -P option to prevent that:

-P inhibits the conversion of port numbers to port names for network files. Inhibiting the conversion may make lsof run a little faster. It is also useful when port name lookup is not working properly.

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