I found my servers were given several requests by unknown hosts.
I tried to find out who they were.
Their locations were one of the good information, which were got in the way written in this post.
GeoIP by MaxMind did a great job.
Preparation: Manjaro/Arch Linux
Install 3 packages via Pamac, the Manjaro package manager:
- About Country
- About City/ASN, Autonomous System Number
AUR is also available.
Besides, installation for other distros is here.
It is a very simple task.
$ geoiplookup %ip-or-fqdn% GeoIP Country Edition: %Country Code%, %Country Name% GeoIP City Edition, Rev 1: %Country Code%, ..., ..., ..., ..., %Latitude%, %Longitude%, ..., ... GeoIP ASNum Edition: ...
Happy computing :)