topic Re: IP Geolocation with Anycast IP addresses in General Topics

IP Geolocation with Anycast IP addresses

Sylvia2 — Tue, 12 Jul 2022 16:40:54 GMT

Hi there,

I am wondering how geolocation is working with IP addresses where anycast is used.

Anycast addresses are shared by multiple server, typically with different locations.

How is such an address assigned to a particular country/region in the Geolocation DB?

Does anybody know?

Thanks,

Sylvia

Re: IP Geolocation with Anycast IP addresses

BPry — Tue, 12 Jul 2022 19:46:45 GMT

@Sylvia2,

I don't think there's any rhyme or reason for where these get placed. CloudFlare's 1.1.1.1 is currently listed in Australia, Google's 8.8.8.8 is listed in the United States, along with Quad9's 9.9.9.9.

Re: IP Geolocation with Anycast IP addresses

Adrian_Jensen — Tue, 12 Jul 2022 20:39:04 GMT

I see the same for various public DNS at the moment, though I have had problems with them changing in the past. So I created a custom region code "CDN" in Objects -> Regions and placed any kind of generic anycast/CDN addresses that I want to communicate with. Use my custom CDN region, in addition to standard country region codes, as the destination in outbound rules.