What Is Locking?
Domain locking (also called registrar lock or transfer lock) is a security feature that prevents unauthorized modifications to your domain's settings — including transfers to another registrar, changes to nameservers, and updates to registrant information.
When a domain is locked, any transfer request will be automatically denied by the registrar. To initiate a legitimate transfer, you must first unlock the domain through your registrar's control panel. This extra step prevents hijacking scenarios where an attacker might try to transfer your domain without authorization.
Most registrars lock domains by default and provide an easy toggle in their control panel. The lock status is visible in WHOIS records as 'clientTransferProhibited.' Premium lock services (registry lock) add additional layers of security for high-value domains.
Why This Matters for Startups
Keep your domains locked at all times unless you're actively transferring them. It's one of the simplest and most effective security measures against domain hijacking. Only unlock when you need to — and re-lock immediately after the transfer completes. For your most valuable domain (your primary brand), consider asking your registrar about registry lock, which requires manual verification for any changes.
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