Ethereum Name Service (ENS) domains are secure domain names for the decentralized world. ENS domains provide a way for users to map human readable names to blockchain and non-blockchain resources, like Ethereum addresses, IPFS hashes, or website URLs. ENS domains can be bought and sold on secondary markets.

ENS domains

333.eth, an ENS name.  ATTENTION: This name contains non-ASCII characters as shown above. Please be aware that there are characters that look identical or very similar to English letters, especially characters from Cyrillic and Greek. Also, traditional Chinese characters can look identical or very similar to simplified variants. For more information: https://en.wikipedia.org/wiki/IDN_homograph_attack