157.161.57.65 => blocked (main NAT ip) 157.161.57.66 => Ok (a static server ip not used anymore) 157.161.57.68 => Ok (a static client ip) 157.161.57.70 => blocked (alternate NAT ip seldom used) 157.161.5.199 => blocked (Gateway IP, not usually used as src, except local stuff on the Mtik like DNS)
Weird! Anyone has insight in what geoIP database coop uses? Or if there are other criteria they use for blocking?
Perhaps they're using some outdated OS where the distributor never bothered to update the geocoding libraries, even when they were obsoleted upstream, such as [1] :)
Jokes aside, perhaps they also have some sort of blocking heuristic in place that goes beyond plain country-based blocking. Did you do anything from those IPs that could have gotten you onto some (unrelated) blocking lists?
[1] https://rpmfind.net/linux/RPM/centos/7.9.2009/x86_64/Packages/GeoIP-1.5.0-14...