ENS is the Ethereum Name Service, a distributed, extensible naming system based on the Ethereum blockchain that can be used to resolve a wide variety of resources such as Ethereum addresses. The Ropsten ENS contract is located at 0x112234455c3a32fd11230c42e7bccd4a84e02010.

For Additional information see http://ens.readthedocs.io/en/latest/introduction.html