Neustar got .neustar and switched the UltraDNS domain to ultradns.neustar. Then they did some sort of corporate split last year and now they’re telling all their customers to switch back to ultradns.com.

Highlights one of the pitfalls to custom TLDs: the corporate sponsor might split or even go bankrupt. Then what happens to all those URLs? Talk about link rot… never thought we would have to worry about TLD rot.