Didn't seem to effect the UK
We use UltraDNS in the UK and it had absolutely no impact on any of the 20 or so domains that we host with them.
A distributed denial of service attack knocked NeuStar's UltraDNS managed DNS service offline for several hours on Tuesday. NeuStar runs high-availability DNS services for customers such as online retailers and IT giants, including Oracle and Juniper. In a statement, NeuStar told Networkworld that the attack affected only a …