Had to use this page again today to solve a geolocation issue with a prefix for a client ISP and thought i'd share.
It has some info that I haven't seen organized all in one place anywhere else.
https://thebrotherswisp.com/index.php/geo-and-vpn/
Geolocation is such a PITA to troubleshoot because even if you update 2 or 3 main DBs, there's always an obscure one that comes back to haunt you.
This is one of the areas that IPv6 is really helping with because prefixes can be more granular in location and due to the abundance of IPs, resources aren't flowing between RIRs with nearly the same frequency as IPv4.
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