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Re: How to tell if something is anycasted?
On Wed, 17 May 2006, Martin Hannigan wrote:
Of Marty's list above, only UltraDNS and PCH are anycast (there are several other anycast networks hosting TLDs that aren't on Marty's list).And there are many, with many TLD's. (rough counts) provider/tld's UDNS 48 ISC 19 PCH 8 PSG 23 ICANN 4 UUNET 61 RIPE 87 DEC 10 NIC.FR 71 Note: There is cross servicing of TLDs counted above. Some numbers may seem low since there seems to be some bit of obfuscation. Or perhaps not and I just haven't confirmed. Some are anycasted, some appear to be physical separations, and some appear to be nested and anycasted i.e. multiple names for the same domain anycasted. I think naming is a bad choice because it's costly to the users and opens the root up to custom configuration by customers which I think is bad. Tagging the route with a community containing the ISO corresponding country could be interesting for location purposes, but of course, that's already been thought of. :)
The numbers there look odd to me. My data is a six months old (I really need to rerun my script and regenerate it), but my list of /24s and the TLDs they host is at:
I assume that in most cases a /24 with multiple DNS server IP addresses being authoritative for TLDs is all run by one entity in a common location or set of locations. UUNet is an exception to the location assumption.