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From what I was able to tell looking at the code, yes.

The database is embedded in the program. Specifically, it is this file:

https://github.com/h2337/connmap/blob/master/connmap/resourc...

Presumably generated by the author with this Python script

https://github.com/h2337/connmap/blob/master/tools/get-ip-da...

Ah, cool, this should incorporate location data at least as good as what the networks self-report! (I suspect that these databases, on top of ingesting all geofeed data, do something similar to Wi-Fi positioning, i.e. correlate the IP address of various GPS-enabled devices with their physical location to try and deduce undocumented/non-public allocation patterns.)

Of course it works fully offline, since then you don't have any network peers to draw on the map.

Localhost has to be somewhere too :)

Correct! GeoIP database is local.

Nice! Where is it from, and do you know if it incorporates geofeed [1] data for networks that publish it?

[1] https://ipregistry.co/blog/geofeeds