.si
.si is a country-code extension for Slovenia, run by Academic and Research Network of Slovenia (ARNES). Academic and Research Network of Slovenia (ARNES) sets who can register .si names; some country codes need a local address, so check its rules before you buy.
| Type | Country code |
|---|---|
| Registry operator | Academic and Research Network of Slovenia (ARNES) |
| Country | Slovenia |
| Who can register | Set by the registry |
| DNSSEC | Signed |
| RDAP server | https://rdap.register.si/ |
| WHOIS server | whois.register.si |
| IANA record | iana.org/domains/root/db/si |
Registrars that sell .si
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All 19 registrars for .si. Other registrars may sell it too.
Look up a .si domain
The .si registry publishes registration data over RDAP. The free domain report reads it and shows a .si domain's registrar, dates, status and DNS in one place. For the raw record, use the WHOIS lookup.
New to extensions? The guide to how domain extensions work covers generic, country-code and brand extensions. For who sells extensions in general, see the list of domain registrars.
Sources: the IANA root zone database and the ICANN list of generic extensions (refreshed 2026-10-24). Something out of date? Tell us.
Frequently asked questions
Who runs the .si extension?
Academic and Research Network of Slovenia (ARNES) is the registry operator for .si, the country-code extension for Slovenia. The registry keeps the list of every .si name; registrars sell the names to the public.
Can anyone register a .si domain?
Academic and Research Network of Slovenia (ARNES) sets who can register .si names; some country codes need a local address, so check its rules before you buy.
How do I look up who owns a .si domain?
The .si registry publishes registration data over RDAP at https://rdap.register.si/ and over WHOIS at whois.register.si. The free domain report on lemon.domains reads it for you and shows the registrar, dates and status.
Is .si signed with DNSSEC?
Yes. The .si zone is signed, so a .si domain can turn on DNSSEC once its registrar adds a DS record.