DNS/Designateについて、ここに記述してください。

http://techs.enovance.com/6351/dnsaas-with-designate-powerdns-and-nsd4 

Designate is a DNS as-a-service project,
it is intended to provide a DNS service for creating, updating, maintaining and deleting DNS data using its API, 
as well as providing DNS resolution for users.

BINDと似たようなサービス？