Hi Peter, Peter Müller: > Hello Michael, > hello nusenu, > hello Martin (???), > > sorry for my late reply. > > Yes, this change is due to an override of mine, committed as f3901759ede298e49cf5c056d0655b97e86cd211, > affecting all location databases generated after January 9th, 2022. thanks for your thorough reply. For me the relevant part was that this is due to a manual override. Maybe something I'll try to understand further: how can I easily determine if some information is provided due to a manual override vs. the raw WHOIS information? And if it was a manual override: What information did trigger that manual override? I don't have any information on where these prefixes are actually located. btw: I'm surprised that you read individual provider company websites to determine and manually override the location of individual ASNs or prefixes of a fiven AS, I didn't expect that to be feasible :) kind regards, nusenu -- https://nusenu.github.io