Who controls the .si domain, and is it safe to build a brand on? (2026)

Clerion Research Team7 October 202612 min read

Who controls the .si domain? ARNES, the Academic and Research Network of Slovenia, a public institution that has run .si since 1992 under published rules and EU law. As of October 2026 a .si name is safe to own and redirect, but a weak main home for a global AI brand, because Google treats it as Slovenian.

Who controls the .si domain? ARNES, the Academic and Research Network of Slovenia, a public institution that has run Slovenia's country code through its Register.si service since 1992. As of October 2026 it is safe to own, because it works under EU law, with published rules and 30 days' notice before they change. But it is a weak main home for a global AI brand.

That's the short answer. The longer one matters, because why you are asking has changed. After the US government started calling AI "super intelligence" in late September 2026, tens of thousands of founders bought a .si name in a few days. Most of them checked the price. Very few looked at who sits on the other side of the deal. (If you need the background, start with what SI means and why the name changed.)

So this post is about that other side: who runs .si, what they are allowed to do to you, how a fight over a name plays out, and how all of it stacks up against .ai, .io and the old story every domain person still tells.

Who actually controls the .si domain?

ARNES controls .si. Its general terms describe it as "a public institution" acting as the Registry, and its registry unit, Register.si, runs registrations and the top-level DNS servers. You never buy from ARNES directly. You buy from one of 94 accredited registrars, which then files your details with the registry.

A few things make this setup unusual, mostly in a good way.

It has been stable for a long time. According to Wikipedia's .si entry, the domain was introduced on 1 April 1992, has no residency rules, and is open to anyone.
It is not run by a private company. The .ai and .io registries both sit with Identity Digital, a commercial operator. ARNES is the same body that runs Slovenia's academic network and the national incident response team, SI-CERT, according to the ARNES site.
It sits inside the EU. Slovenia is an EU member state, so the registry works under EU law. The NIS2 directive, for example, says in recital 109 that accurate domain registration data is "essential to ensure the security, stability and resilience of the DNS". That is why .si registrars ask for real holder details.

Nor is it a startup that is chasing a windfall. When press coverage compared the .si rush to Anguilla's .ai income, Register.si pushed back. CircleID reported on 1 October 2026 that the registry charges about €10 per domain, estimated the extra September revenue at roughly €300,000, and warned against the comparison with .ai, which earned Anguilla US$85.3 million in 2025.

Can the .si registry take my domain away?

Yes, but only on grounds written into its published terms. Under the General Terms and Conditions (in force since 15 November 2024), ARNES can delete a .si name if it expires unrenewed, if the holder breaks the terms, or if a court or dispute decision orders it. It can also temporarily deactivate a name after a court decision.

Here is what that means when you actually hold one.

Expiry is the real risk. Terms run from 1 to 5 years. An unrenewed name goes into "quarantine" for up to 30 days, then it is deleted and anyone can register it (clauses 5.4.2 and 5.4.3).
Content rules exist, but they are narrow. Register.si's own guidance page says names cannot be registered "contrary to the law, public order and morals". That is a statement about the name and its lawful use, judged under Slovenian and EU law, not a vague religious or political standard.
Rule changes come with notice. ARNES must publish changes "at least 30 days prior to their entry into force" (clause 16.2). Urgent changes can move faster (clause 16.3), which is the one clause worth watching.

The way founders most often lose a .si name has nothing to do with ARNES at all. The same Register.si page warns about agencies and freelancers who register a client's domain under their own name, then hold it hostage at renewal time. Whoever is listed as the holder owns it. So make sure that is your company.

What happens if someone disputes my .si domain?

Disputes go to Register.si's own arbitration, called ARDS, or to a Slovenian court. Under the ARDS rules, a complainant must prove three things: the name matches their trademark, company name or personal name; you have no legitimate interest in it; and it was registered or used in bad faith. If they win, the name is deleted or transferred to them.

It is quick, and cheap enough that a serious brand owner will not think twice about using it.

Step	What the ARDS rules say
Filing fee	€700 including VAT for 1 to 5 domains (Art. 9.2)
Your response window	21 days from when the name is blocked (Art. 12.1)
Decision	Within 14 days of the arbiter's appointment (Art. 17.5)
Who decides	One arbiter, or a panel of three if a party asks (Art. 5.3)
Language	Slovenian (Art. 4.1)
Appeal	No appeal inside ARDS, but courts stay open (Art. 1.3, 17.8)

Two of those lines are worth a second look. First, the language. A non-Slovenian founder facing a complaint will need a translator or a local lawyer quickly, because 21 days is not long. Second, the bad-faith test cuts both ways. If you bought yourbrand.si to protect a name you already use on yourbrand.ai, you have a clear legitimate interest. If you bought openai-tools.si hoping someone would pay for it, you are the textbook respondent.

And this is not a theory right now. CircleID reported that about 52% of the .si names registered through Dynadot during the rush were later listed for resale. Names that pair a famous brand with "SI" are exactly what ARDS was built to unwind.

How does .si compare with .ai, .io and .ly on control risk?

On who controls it and how predictable the rules are, .si is one of the safer country codes an AI founder can pick. The bigger long-term questions hang over .io, whose territory is changing hands, and over small registries with vague content rules. .ai is commercially stable but expensive and run for a government's revenue.

	.si	.ai	.io	.ly (2010 case)
Country	Slovenia (EU)	Anguilla	British Indian Ocean Territory	Libya
Registry operator	ARNES, a public institution	Identity Digital since January 2025	Identity Digital	NIC.ly
Main control risk	Expiry, disputes, 30-day rule changes	Price, 2-year minimum term	Territory transfer could retire the code	Content judged under local law
Google treats it as	Slovenian (geotargeted)	Generic	Generic	Libyan (geotargeted)
Size	315,921 names on 7 Oct 2026	1,277,727 names in June 2026	n/a	n/a

Sources for the table: Register.si, Wikipedia on .ai, Wikipedia on .io, Google Search Central and TechCrunch.

The .ly row is the story every domain veteran tells. In 2010 Libya's registry seized vb.ly, a link shortener, because it judged the site's content to break Libyan law, TechCrunch reported at the time. The lesson was never "country codes are unsafe". It was that a registry's law becomes your law.

The .io row is live news. The UK and Mauritius signed a treaty on 22 May 2025 to hand over the Chagos Islands, but Al Jazeera reported on 2 October 2026 that it still has not entered into force. If the "IO" country code is ever withdrawn, Wikipedia's .io entry notes that current IANA rules point to a phase-out taking at least five years. Slovenia has no comparable question hanging over it.

Is the 2026 .si rush a risk for my brand?

The rush is mostly a risk to speculators, not to founders who register their own name. The registry grew from 186,159 names in June 2026 to 315,921 on 7 October 2026, per Wikipedia and Register.si's live counter. That is a 70% jump in about four months, almost all of it after the "super intelligence" rename.

So what does that mean for you?

Your name may already be taken. Check today, not next quarter. Register.si showed 19,503 new names in the 24 hours before we checked on 7 October 2026.
Phishing has not followed yet. Netcraft wrote on 1 October 2026 that it had yet to see more phishing tied to the rename, though it did record speculative brand registrations, including 87 .com names pairing brands with "superintelligence" at a $20,000 asking price each.
The registry is not changing course. Nothing on Register.si's homepage announces new rules, price changes or restrictions because of the surge. The rules that applied in 2024 still apply.

The quiet risk is what happens when all of that comes up for renewal. A lot of these names were bought on impulse with first-year discounts. Some of them will likely lapse in late 2027, the 30-day quarantine will run out, and someone else will pick up the name. If you plan to keep yours, set it to renew automatically and put the date in a calendar you actually check.

Is a .si domain safe for SEO?

It is safe as a redirect and a poor choice as your main site outside Slovenia. Google's international SEO guidance says a country code is "a strong signal" that a site targets that country. .si is not on Google's list of country codes treated as generic, while .ai and .io are.

This is the part people tend to skip. Owning .si carries little control risk, but hosting your product on it costs you reach in search outside Slovenia. There is no setting in Search Console that overrides it. Google added .ai to the generic list in 2021, and .si could follow one day, but nothing announced so far says so.

Our guide to buying a .si domain walks through the permanent redirect setup for Cloudflare, Vercel, Netlify and Nginx. The short version: send yourname.si with a 301 or 308 to your main domain, path for path.

So is a .si domain safe to build a brand on?

Safe to own, yes. Safe as your only home, no. The registry is a public EU institution with published rules, notice periods and a fast, cheap dispute process. The risks you control are bigger than the ones it controls: who is listed as holder, whether it renews, and where it points.

Say you run an AI note-taking tool at notely.ai (a hypothetical). This is how we would think it through.

Buy notely.si, in your company's name. It costs roughly a lunch and stops someone else from using it to look like you.
Point it at notely.ai with a permanent redirect. People who type the .si version reach you. Google keeps ranking the generic domain.
Do not move the product to .si. You would trade a generic domain for a Slovenian one in Google's eyes, and gain nothing a redirect does not already give you.
Skip the "SI" spin-off names you will not use. Extra names like notely-si.si with no plan behind them are just renewals waiting to lapse.

The founders who get hurt by .si in 2027 will be the ones who bought names they did not own, did not renew, or did not redirect. None of that is on the registry.

Do this tonight

Look up your name on Register.si and buy it through a registrar if it is free.
Check the holder record. It should show your company, not your agency, freelancer or personal email.
Turn on auto-renew and set a calendar reminder 60 days before expiry.
Add a permanent 301 or 308 redirect from the .si name to your main domain, then test one deep link.
Ask ChatGPT and Perplexity "who controls the .si domain" and "is .si safe for an AI startup", and note which sources they cite. That is your baseline for this topic.

Once the redirect is live, you will want to see who actually uses it, and whether AI assistants start sending people your way. Clerion reports ChatGPT, Perplexity, Claude, Gemini and Copilot as their own channel from one script tag, with no cookies and no banner.

What is SI? Super intelligence, the new name for AI, explained: why .si suddenly matters.
Things to know before you buy a .si domain: prices, registrars and redirect setup.
SI vs AGI vs ASI: what's the difference?: the terms behind the name.
How do I get my product recommended by ChatGPT and other SI assistants?: the next step once your domains are in order.

Frequently asked questions

Who runs the .si domain registry?

ARNES, the Academic and Research Network of Slovenia, runs .si through its registry unit Register.si. Its general terms describe it as a public institution. You register through one of about 94 accredited registrars, not with ARNES directly.

Can anyone register a .si domain?

Yes. There is no residency or local presence requirement for .si. Anyone, person or company, can register a name of 2 to 63 characters on a first-come, first-served basis for terms of 1 to 5 years.

What happens if my .si domain expires?

An unrenewed .si name goes into quarantine for up to 30 days. If you renew in that window it comes back. After that it is deleted and anyone can register it, so turn on auto-renew.

How are .si domain disputes resolved?

Through Register.si's ARDS arbitration or a Slovenian court. ARDS costs €700 including VAT for 1 to 5 domains, the holder gets 21 days to respond, a decision follows within 14 days of the arbiter's appointment, and the procedure runs in Slovenian.

Is .si riskier than .io or .ai?

On control, .si is among the safer country codes: an EU public institution with published rules and 30 days' notice for changes. .io faces questions from the Chagos handover, and .ai is run commercially for Anguilla's revenue and costs far more.

Should I host my AI startup on a .si domain?

Not as your main site if you sell worldwide. Google treats .si as Slovenian, not generic, so it can cost you search reach elsewhere. Own the .si name and send it to your .com or .ai with a permanent 301 or 308 redirect.

Can the .si registry change its rules?

Yes, but ARNES must publish changes at least 30 days before they take effect, under clause 16.2 of its general terms. Urgent changes can take effect sooner under clause 16.3.

Sources

who controls the .si domain.si domainsuper intelligencedomainsai startupsbrand protection