[dns-operations] Public resolvers with EDNS Client Subnet

[Brian Somers]

It’s not a list I’m afraid, but the OpenDNS/Cisco resolvers do ECS.
The opt-in is with the authority although we plan to look at making this
happen automatically at some point, as managing a list of authorities
Is becoming quite a burden.

When we receive ECS from a client, we ignore it unless the prefixlen
Is zero (in which case we don’t send ECS upstream).  This is as a
result of being contractually obliged to disallow client ECS probing.

Our opt-in config is based on the nameserver and/or the zone.
This gives us flexibility but can cause problems when the upstream
changes some of their nameserver names...

Not sure if this is helpful.

—
Brian

> On Jun 24, 2020, at 6:10 AM, Jan Včelák <jv at fcelda.cz> wrote:
> 
> Hello.
> 
> I'm looking for a list of public resolvers that utilize EDNS Client
> Subnet when sending queries to authoritative servers. I'm especially
> interested in the ones that require some kind of opt-in to enable the
> feature. Is anyone aware of such a list?
> 
> Thank you. Regards
> 
> Jan / NS1
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