[dns-operations] Large amount of queries received from OpenDNS

[Antoine JOUBERT]

Hi,

We've been receiving a large amount of queries from OpenDNS over the 
last month or so.

It looks like dictionary-based zone enumeration, but each record is 
requested between 10 and 20 times.

Is anybody else seeing the same behavior from OpenDNS's resolvers?

I've tried contacting them multiple times on their abuse mailbox 
(abuse at opendns.com), but I've not received a reply yet.

Could anyone provide me with an alternate contact that could look into 
this issue?

Thanks!

Antoine