Here are the sequence of emails we as a customer received:<p>1:44PM PST -
The Neustar UltraDNS service is currently experiencing DDoS traffic in the U.S. East Region. The Security  Operations Team is currently working on mitigating attack traffic and further updates will be provided as soon as possible.<p>3:07PM PST -
The Neustar UltraDNS service is currently experiencing  a major spike in traffic across several regions. The Security  Operations Team is conducting routing changes and working to reroute traffic at this time. Customer will experience DNS timeouts and lack of resolution. Further updates will be sent as soon as possible.<p>4:50PM PST -
At 4:18 EDT time, a service outage affected Neustar’s UltraDNS service. The impact was predominately on the East Coast of the U.S., however some impacts could be seen in other U.S regions.  Neustar UltraDNS Service was restored at 6:34 EDT time.  We are currently investigating the root cause of the outage and will provide an update as more information is available.