ENS Subgraph is a tool for querying and indexing data from the Ethereum Name Service (ENS) smart contracts. It allows developers to easily retrieve data such as the current owner of a domain name, the owner's resolver contract address, the address associated with a domain name, and more.  The data is indexed from the ENS registry contract, the ENS reverse registrar contract, and the resolver contracts associated with each domain name. By utilizing the queried data, developers can create custom dashboards and analytics tools.