About .si
The .si domain is the country code top-level domain (ccTLD) for Slovenia, a member of the European Union since 2004. Renowned for its landscapes, rich cultural heritage, and innovative spirit, Slovenia's digital presence lives within the .si domain space.
The .si domain was introduced in 1990, shortly before Slovenia gained independence in 1991. It's managed by ARNES (Academic and Research Network of Slovenia), which oversees registration, domain management, and dispute resolution to keep the .si namespace stable and secure for businesses and individuals worldwide.
Today, .si carries a second meaning. In the AI industry, SI is shorthand for superintelligence, and companies around the world now register .si domain names for AI products, research labs, and brand protection. Registration is open to individuals and businesses everywhere, with no local presence required.
The .si domain for superintelligence
Superintelligence, also written super intelligence, describes the step beyond today's artificial intelligence. It refers to systems that can learn, reason, and improve themselves past anything built so far, and it's become the word AI labs and startups use for where their work is headed.
As AI companies adopt the term, the matching domain name is .si. Registrations have accelerated quickly, growing from about 190,000 .si domains in early September 2026 to more than 235,000 by October. With about one .si domain for every six .ai domains, far more short, brandable names are still available.
Why register a .si domain?
Whether you're protecting a brand, launching an AI product, or reaching customers in Slovenia, a .si domain does more than one job.
Defensive coverage. If you own yourbrand.com or yourbrand.ai, registering yourbrand.si keeps the name away from squatters and lookalike sites. If it's already taken, our team can approach the current holder about a purchase.
AI products and models. A short .si web address can front an assistant, model, or research lab. Point it to your main site with free web forwarding until you're ready to build.
Slovenia and the EU. .si is the local choice for customers in Slovenia. It sets your site apart in local search and signals a real presence in an EU market, so you can tailor content, offers, and campaigns to Slovenian customers.
Registering your .si domain
Anyone can register a .si domain, whether you're an individual or a business, with no local presence required. Because Slovenia is part of the EU, its NIS2 cybersecurity rules ask that every .si domain use accurate, current contact details, so make sure the name, address, email, and phone number on your account are up to date.
- Full name of the registrant (person or organization)
- Physical address (anywhere in the world)
- Email address
- Phone number
Private registration isn't available for .si, so we recommend registering under a contact that stays accurate as your team changes. Orders with missing or inaccurate details may be delayed until they're corrected.
.si is also associated with "Super Intelligence"
Take advantage of a short, two-letter extension! Because the .si domain operates without restrictions, it can be registered like a generic domain for "Super Intelligence". You can also check out our list of generic country domains for other options.
Frequently asked questions about .si
Technical information for .si
- TLD .si
- Type ccTLD
-
Registration
79.99 USD / year
On Sale 49.99 USD first year only - Renewal 89.99 USD / year
- Transfer 69.99 USD / year | Transfer in your .si
- Time to Register Instant
- Registration Period Available for 1, 2, 3, 4 and 5 year(s)
- Private Registration Not Available
- DNSSEC Supported | Learn how to add DNSSEC
- Trustee/Proxy Service No
- Languages Supported Danish, Dutch, French, German, Irish, Italian, Lithuanian, Portuguese, Slovenian, Spanish,
- Individuals can register Yes
- Businesses can register Yes
- Registry Academic and Research Network of Slovenia (ARNES)
- Information updated 2026-10-05