Every era of tech picks up a domain name. The dot-com boom made .com the default for business, .io became shorthand for software, and .ai, the country code for Anguilla, became the web address of an entire industry. Both are country codes that took on a global meaning. The .si domain is next in line, and the reason is a single word the AI world keeps reaching for.
What does SI mean in AI?
SI is short for superintelligence, the step beyond today’s AI, describing systems that can learn, reason, and improve themselves past anything built so far. It’s still a goal rather than a product, and researchers save the term for that next leap, as National University of Singapore lecturer Ben Leong told the BBC in 2026.
Ilya Sutskever named his company Safe Superintelligence in 2024. In 2025, Meta named its lab Meta Superintelligence Labs. AI startup Recursive Superintelligence paid $20,000 for recursive.si in 2026 to match. The word AI companies want right now is superintelligence, and the domain that matches it is .si.
Why AI companies are registering the .si domain
The .si domain is Slovenia’s country code, run by the national registry ARNES. It’s open to businesses worldwide with no local presence requirement, it supports DNSSEC, and .si domain registration is instant.
Recursive still runs its main site on its .com, which makes recursive.si a defensive buy. That’s how most brand teams see .si today, as a name worth owning before someone else does.
Is .si the next .ai domain?
Interest in .si has picked up fast.
.si vs .ai by the numbers (October 2026)
- .si today: more than 235,000 registered domains, with over 46,000 added in September 2026 alone, per register.si
- .si in August 2026: 3,515 new registrations for the whole month, as Domain Name Wire reported
- .ai today: about 1.5 million registered domains, up from roughly 100,000 at the end of 2022, per DomainNameStats.com
- The gap: The .ai domain is about six times larger, and .si is roughly the size .ai was in 2023
With about one .si domain for every six .ai domains, far more short, brandable .si names are still open.
It’s early. It took .ai years to become an industry default, and Google only began treating it as a global domain name in 2023. Google still treats .si as a Slovenia signal, so it works best alongside a primary .com or .ai site. Whether .si becomes the next .ai is a bet. Securing your name while it’s still affordable isn’t. Short, memorable names get taken first, and registering yours today costs far less than buying it on the aftermarket later.
How brands and AI teams are putting .si to work
- Defensive coverage: If you own yourbrand.ai or yourbrand.com, registering yourbrand.si keeps the name away from squatters and lookalike sites. If it’s already taken, Domain Concierge can approach the current holder about a purchase.
- AI products and models: A short .si address can serve as a memorable name for an assistant, model, or research lab, whether it hosts its own site or redirects to your main one.
- Slovenia and the EU: The .si domain is still the local choice for customers in Slovenia and a clear signal of presence in the region.
The .si domain won’t replace .ai any more than .ai replaced .com. It gives brands building in AI a short name that matches the word the industry uses for its next chapter, and that’s worth securing while the best names are available.
Search .si domain names for your brand and AI products
101domain registers .si instantly, supports DNSSEC, and manages it alongside the rest of your domain portfolio. New .si registrations are $49.99 for the first year through the end of December 2026 (regularly $79.99).
Search .si domains
Frequently asked questions
It’s the country code domain name for Slovenia, managed by the national registry ARNES. Anyone worldwide can register one.
In the domain world, .si is Slovenia’s country code. In AI, “SI” is increasingly used as shorthand for superintelligence, which is why AI companies have started registering .si names.
Superintelligence, also called artificial superintelligence (ASI), describes AI that could learn, reason, and solve problems at a level beyond human capability in every field, including improving its own design. It’s still a research goal, and a growing number of well-funded AI labs are building toward it.
AI covers the tools in use today, such as assistants, models, and automation built for specific tasks. Artificial general intelligence (AGI) is the next milestone, AI that matches human ability across a wide range of tasks. SI goes further still, and many AI companies now use it to describe where their work is headed.