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I'm colorblind and had to change the dots color. Might be a nice config option.

There's a 'good first issue'-labeled issue for this from 2023: https://github.com/h2337/connmap/issues/14

Maybe they were expecting first hops like from traceroute. Maybe traceroute is an interesting way to continue developing.

Okay, got it, thanks. I suppose it could also be the FIOS router itself making those connections, or any of the other systems on my local network.

No, for normal network configurations they wouldn't show. It's most likely your system connmap is running on making those connections.

You might be surprised how much traffic every device makes.

It's only showing connections directly initiated by your computer. Not anything "upstream" of you like the FIOS router. It would also show any connections TO your computer, but being behind NAT on a normal home network, that would likely be nothing unless you've intentionally punched holes.