The caching servers are typically close to the user: at your ISP, in your office's server closet, in your data center, etc. In the case of public recursive DNS

The caching servers are typically close to the user: at your ISP, in your office's server closet, in your data center, etc. In the case of public recursive DNS providers such as OpenDNS and Google Public DNS, this requires a recent extension to DNS: http://arstechnica.com/telecom/news/2011/08/opendns-and-google-working-with-cdns-on-dns-speedup.ars http://arstechnica.com/telecom/news/2011/08/opendns-and-goog...