All TLDs / .gmx

What is .gmx?

The short answer
.gmx is a brand top-level domain, operated by 1&1 Mail & Media GmbH. 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
1&1 Mail & Media GmbH

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

Is .gmx a real domain extension?

Yes — .gmx 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 .gmx?

.gmx is operated by 1&1 Mail & Media GmbH, per the IANA root database.

What is .gmx used for?

.gmx is a dot-brand registry — it's reserved for 1&1 Mail & Media GmbH and isn't used for third-party websites.

Can anyone register a .gmx domain?

No. .gmx 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.