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I thought recursive resolvers are geographically local enough for caching web services. I checked mine and it seems to be 4 hops away, 2 beyond our network perimeter.

\24 is very intrusive and what about those who are behind ISP NATs. \24 may not be as useful to Google.

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For most people they are but you'd be surprised at how many basly-placed or -configured resolvers there are out there.

Consider a nationwide ISP with resolvers on East coast and West coast. For "failover" they assign them in random order to customers. That means 50% of the time a customer of the ISP in Tampa will appear to be coming from a resolver in San Jose.

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