If you are working with an ENS library, your library will automatically find the ENS deployment you need. If for whatever reason, you need to interact with ENS directly, details for the currently supported deployments are detailed here.
On mainnet, the following registrars are deployed:
- .eth, using the .eth Permanent registrar.
- .xyz, via DNS integration
- .art, via a custom integration
Ropsten test network has the .test registrar deployed. This registrar permits anyone to instantly register a domain for testing purposes; these domains persist for 28 days.
In addition, the test networks also have a deployment of the .eth registrar for testing purposes.