Hi Vladimir,

Yes, this is all packets being dropped to their nameserver IP addresses, so no response at all on either UDP or TCP.

Thanks,

Paul

On Fri, Apr 30, 2021, 4:40 AM Vladimír Čunát <vladimir.cunat@nic.cz> wrote:

Hello.

On 4/30/21 5:05 AM, Paul Furtado wrote:
> there are certain authoritative nameservers that block
> large swaths of the AWS IP range, causing resolution to fail for us.

What kind of blocking is this? Not replying at all?

--Vladimir