EDNS Client Subnet

EDNS Client Subnet or ECS is a DNS extension that allows a recursive DNS resolver to specify the network subnet for the host on which behalf it is making a DNS query. This is generally intended to help speed up the delivery of data from content delivery networks, by allowing better use of DNS-based load balancing to select a service address serving the content expected to be hosted at that domain name, when the client computer is in a different network location from the recursive resolver.[1] [2] The EDNS client subnet mechanism is specified in RFC 7871.

As of 2019, DNS resolution service providers supporting EDNS Client Subnet include Google Public DNS, OpenDNS and Quad9.

References
  1. "How it works". A Faster Internet. Archived from the original on 2018-03-28. Retrieved 2018-03-27.CS1 maint: unfit url (link)
  2. "EDNS Client Subnet (ECS) Guidelines | Public DNS | Google Developers". Google Developers. Retrieved 2018-04-02.


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