About OnchainNamespace
Learn about OnchainNamespace — the free, client-side bulk availability checker for ENS and Basenames.
What is OnchainNamespace?
OnchainNamespace is a free, open tool for checking the availability of ENS (Ethereum Name Service) domains and Basenames in bulk — entirely in your browser.
No API keys. No rate limits. No backend. Just pure client-side Web3.
Why We Built This
Registering an onchain domain name is one of the most personal acts in Web3. Whether you're looking for your first ENS handle, a short Basename for your wallet, or researching available names for a project — doing it one name at a time is tedious.
We built OnchainNamespace to let you paste a list of names and instantly see which are available, which are taken, and when taken ones expire.
How It Works
The checker talks directly to ENS and Base smart contracts via public RPC endpoints — entirely client-side. Your name list never leaves your browser.
- ENS (.eth): Queries
BaseRegistrarImplementationandETHRegistrarControlleron Ethereum mainnet - Basenames (.base.eth): Queries
BaseRegistrarandRegistrarControlleron Base L2
Privacy
We don't log your name queries. We don't store anything server-side. The tool runs entirely in your browser.