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I've been trying to find an example of an anycast IP address used by a hugely popular service or a website.

According to my queries at https://www.whatsmydns.net/ , none of the large sites that are known to have datacenters around the world, like

  • www.google.com
  • www.instagram.com
  • www.facebook.com
  • www.youtube.com

all run on an identical DNS A/AAAA resource record set from all around the world; they all apply GeoDNS to some extent, and return different IPs in different countries.

Do you know any examples of a globally distributed website that fully opt-in to using the same public DNS records everywhere?

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    One “hugely popular service” are the root DNS servers. The use of anycast helped some of them survive a DDOS attack around 2007. ripe.net/publications/docs/ripe-393 But since it’s not a website, put in comments rather than an answer. – Darrell Root Jan 8 at 1:01
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    Another non-web hugely popular service are large public resolvers such as Google's DNS servers 8.8.8.8 etc. From another point of view, you might regard 192.168.0.1 (world's most common LAN-side address for "route to internet nearest me") as a special case of anycast. – jonathanjo Jan 8 at 10:44
  • Maybe you meant BGP anycast? – Mikael Dúi Bolinder Jan 18 at 11:21
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A couple of examples are:

There are always exceptions however - you'll notice that within China, the IP for say api.twitter.com is different for reasons that are most likely not technical.

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The anycast IP with most traffic in the world is 127.0.0.1.

- Unknown, 2020-01-18

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    However, 127.0.0.1 is not a global anycast address, and in most cases there’s no website running on it. – Teun Vink Jan 18 at 15:00

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