The point of using UltraDNS is that it they provide fast "real-time" failover of DNS routing. This is used, for example, for fault tolerance where the IP addre

The point of using UltraDNS is that it they provide fast "real-time" failover of DNS routing. This is used, for example, for fault tolerance where the IP address responding to a domain name might change due to failure scenarios or load balancing (where a different server is now primary responder to the domain name, maybe located in a different data center or country). Infrastructure-wise, UltraDNS is kind of like the Akami of DNS, instead of content distribution.