Use it when someone gives you an ENS name such as vitalik.eth and you need the address to pay or check, or when you have an address and want its primary ENS name. Forward lookups also return the address's primary name so you can confirm it points back. Uses the ENS Universal Resolver on Ethereum mainnet, offchain (CCIP-Read) names included. Pass name or address. Never charged for errors: we settle the payment only after a successful answer.