All TLDs / .si

What is .si?

.si is the country-code top-level domain assigned to Slovenia, run by Academic and Research Network of Slovenia (ARNES). It's live in the IANA DNS root zone. Registration is open through accredited registrars, though some country registries add local-presence or ID requirements.
Type
Country code (Slovenia)
Registration
Open to public
In DNS root
Yes

Registry operator: Academic and Research Network of Slovenia (ARNES) — per the IANA root database.

Source: IANA root zone database, checked August 23, 2026.

Is .si a real domain extension?

Yes — .si 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 .si?

.si is operated by Academic and Research Network of Slovenia (ARNES), the registry responsible for Slovenia, per the IANA root database.

What is .si used for?

.si is the extension tied to Slovenia. Many country codes are also used generically for branding when the letters spell something useful.

Can anyone register a .si domain?

Generally yes — .si is open through accredited registrars, though some country registries require local presence or ID. Availability of a specific name depends on whether it's already taken.

.si and Slovenia

.si is the country-code top-level domain assigned to Slovenia, administered by the registry Academic and Research Network of Slovenia (ARNES).

.si is the Internet country code top-level domain (ccTLD) for Slovenia. It is administered by the ARNES, the Academic and Research Network of Slovenia. In 2010, the registry hosted 80,000 domain names. In 2012, that number increased to 100,000. In 2022 this number crossed 150,000.

Source: Wikipedia — .si (CC BY-SA)

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