All TLDs / .otsuka

What is .otsuka?

The short answer
.otsuka is a brand top-level domain, operated by Otsuka Holdings Co., Ltd. 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
Otsuka Holdings Co., Ltd

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

Is .otsuka a real domain extension?

Yes — .otsuka 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 .otsuka?

.otsuka is operated by Otsuka Holdings Co., Ltd., per the IANA root database.

What is .otsuka used for?

.otsuka is a dot-brand registry — it's reserved for Otsuka Holdings Co., Ltd. and isn't used for third-party websites.

Can anyone register a .otsuka domain?

No. .otsuka 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.