AWS says "We are investigating elevated errors resolving the DNS hostnames used to access some AWS services in the US-EAST-1 Region." Is that coincidental, or are they being DDoSed also?
$ host -t NS us-east-1.amazonaws.com
us-east-1.amazonaws.com name server ns3.p31.dynect.net.
us-east-1.amazonaws.com name server ns1.p31.dynect.net.
us-east-1.amazonaws.com name server ns2.p31.dynect.net.
us-east-1.amazonaws.com name server ns4.p31.dynect.net.
$ host -t NS us-east-2.amazonaws.com
us-east-2.amazonaws.com name server u4.amazonaws.com.
us-east-2.amazonaws.com name server u6.amazonaws.com.
us-east-2.amazonaws.com name server u3.amazonaws.com.
us-east-2.amazonaws.com name server u2.amazonaws.com.
us-east-2.amazonaws.com name server u1.amazonaws.com.
us-east-2.amazonaws.com name server u5.amazonaws.com.
us-east-2.amazonaws.com name server ns2.p31.dynect.net.
us-east-2.amazonaws.com name server ns1.p31.dynect.net.
us-east-2.amazonaws.com name server pdns1.ultradns.net.
us-east-2.amazonaws.com name server pdns5.ultradns.info.
us-east-2.amazonaws.com name server ns3.p31.dynect.net.
us-east-2.amazonaws.com name server ns4.p31.dynect.net.
us-east-2.amazonaws.com name server pdns3.ultradns.org.
$ dig ns eu-west-1.amazonaws.com +short
ns3.p31.dynect.net.
ns1.p31.dynect.net.
ns4.p31.dynect.net.
ns2.p31.dynect.net.
$ dig ns eu-west-2.amazonaws.com +short
u6.amazonaws.com.
u5.amazonaws.com.
u2.amazonaws.com.
u4.amazonaws.com.
u1.amazonaws.com.
u3.amazonaws.com.
pdns1.ultradns.net.
pdns3.ultradns.org.
pdns5.ultradns.info.
ns2.p31.dynect.net.
ns1.p31.dynect.net.
ns4.p31.dynect.net.
ns3.p31.dynect.net.
us-east-1 is the oldest region and predates Route 53. Not adding extra DNS providers to the older regions is probably an oversight.
(The EC2 API team requests load balancers from a separate load balancer team. The load balancer team probably didn't exist as a separate team when some of these regions were created.)
$ host -t NS us-east-1.amazonaws.com
us-east-1.amazonaws.com name server pdns5.ultradns.info.
us-east-1.amazonaws.com name server ns3.p31.dynect.net.
us-east-1.amazonaws.com name server pdns1.ultradns.net.
us-east-1.amazonaws.com name server pdns3.ultradns.org.
us-east-1.amazonaws.com name server ns4.p31.dynect.net.
us-east-1.amazonaws.com name server ns1.p31.dynect.net.
us-east-1.amazonaws.com name server ns2.p31.dynect.net.
us-east-1.amazonaws.com name server u1.amazonaws.com.
us-east-1.amazonaws.com name server u2.amazonaws.com.
us-east-1.amazonaws.com name server u3.amazonaws.com.
us-east-1.amazonaws.com name server u4.amazonaws.com.
us-east-1.amazonaws.com name server u5.amazonaws.com.
us-east-1.amazonaws.com name server u6.amazonaws.com.Don't confuse regions with availability zones. (Though in this case, the availability zones don't help...)
6:36 AM PDT [RESOLVED] Between 4:31 AM and 6:10 AM PDT, we experienced errors resolving the DNS hostnames used to access some AWS services in the US-EAST-1 Region. During the issue, customers may have experienced failures indicating "hostname unknown" or "unknown host exception" when attempting to resolve the hostnames for AWS services and EC2 instances. This issue has been resolved and the service is operating normally.