Blocklist for AS112 servers?

[Cox, Kenneth N]

My organization, Optum / UnitedHealthGroup, has been sending DNS

 traffic to the iana blackhole servers at 192.175.48.6 and

192.175.48.42- from the following ip addresses:

198.203.177.177

198.203.175.175

198.203.181.181

 As of June 7 we stopped receiving replies from the blackhole servers.

I am trying to diagnose whether this is a routing issue or whether we

 have been blocked for high traffic volume.

Is there a blocklist for servers used by iana blackhole servers?


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