All TLDs / .tdk

What is .tdk?

The short answer
.tdk is a brand top-level domain, operated by TDK Corporation. It's a “dot-brand” registry (ICANN Spec 13) — reserved for the operator's own use, so it isn't open for the public to register. It's live in the official IANA DNS root zone.
Type
Brand (dot-brand)
Registration
Closed (brand)
In DNS root
Yes
Operator
TDK Corporation

Source: IANA root zone database, checked October 18, 2026.

Is .tdk a real domain extension?

Yes — .tdk is a real top-level domain. It's present in the official IANA DNS root zone, which is the authoritative list of every live TLD on the internet.

Who runs .tdk?

.tdk is operated by TDK Corporation, per the IANA root database.

What is .tdk used for?

.tdk is a dot-brand registry — it's reserved for TDK Corporation and isn't used for third-party websites.

Can anyone register a .tdk domain?

No. .tdk is a closed brand registry, so it isn't available for public registration. A registrar search will confirm the current policy for any specific name.