EDNS Client Subnet

EDNS Client Subnet (ECS) is an option in the Extension Mechanisms for DNS that allows a recursive DNS resolver to specify the subnetwork for the host on whose 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 near the client when the client computer is not necessarily near 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[]

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

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[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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