@ens:available

Check whether a .eth name is available for registration.

On-chain (@ens:available!): Mainnet only: an assertion reads the chain it runs on, and ENS cannot be reached from another chain.

Returns: bool

Syntax

@ens:available(name)

Arguments

Name	Type	Description
name	string	.eth name or label (e.g. vitalik.eth or vitalik)

Examples

# Check availability before registering
set $free @ens:available("mydao.eth")
print $free

See Also

On-chain face (@ens:available!)

Mainnet only. An assertion is judged on the chain it runs on, and there is no way to reach the ENS registry from another chain, so the on-chain face refuses at composition time rather than staticcalling an address with no code and reverting opaquely later.

Sepolia is refused too, deliberately. The plain face resolves against mainnet through a dedicated client, so a sepolia registry would answer about a DIFFERENT namespace: @ens:available and @ens:available! would return two unrelated answers and both would look right. Off mainnet, use the plain face — it resolves at composition time and is not restricted by the executing chain.

Notes

• Asks the controller directly, so it reflects the registrar's own rules (length, reservations) rather than only whether the name is registered.