How long is a domain's transfer code (auth code) valid?

The transfer code (also called an auth code, EPP code, or, for .ro domains, a transfer key) is a unique code generated by a domain's current registrar, needed to start transferring it to another agent.

The code's validity differs by extension and registry policy:

• for most generic extensions (.com, .net, .org, etc.), the code is usually valid for a limited time (a few days up to a few weeks) after being generated, after which it must be regenerated by the current registrar;
• for .ro domains, the transfer key is obtained directly from the RoTLD portal and has its own validity period set by RoTLD;
• for .eu domains, the code is obtained from the current registrar and is valid for a limited period.

If a code expires before you finish the transfer, you'll need to request a new one from the current registrar (or from the RoTLD portal, for .ro) — the transfer process cannot continue with an expired code.