All TLDs / .citadel

What is .citadel?

The short answer
.citadel is a brand top-level domain, operated by Citadel Domain LLC. 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
Citadel Domain LLC

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

Is .citadel a real domain extension?

Yes — .citadel 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 .citadel?

.citadel is operated by Citadel Domain LLC, per the IANA root database.

What is .citadel used for?

.citadel is a dot-brand registry — it's reserved for Citadel Domain LLC and isn't used for third-party websites.

Can anyone register a .citadel domain?

No. .citadel 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.