To examine an address, and thus know the structure, check with How can I Test if an Ethereum address is valid? N.B: Vanity-ETH is made to be a user-helpful Instrument that operates right in the browser, providing simple accessibility with no really need to download or install additional computer software. https://tron09629.tribunablog.com/the-ultimate-guide-to-ethereum-wallet-address-generator-42243769