A new domain trend has taken over the internet, and it comes down to two letters: SI. If you build websites, invest in domains, or run an AI-related project, here is what is behind the hype and whether you should act on it.
What Is a .si Domain?
.si is the country code top-level domain (ccTLD) of Slovenia. It has existed since 1992 and was used mostly by Slovenian businesses and organizations. It rarely made global headlines until this autumn.
Why Did .si Suddenly Become Popular?
The surge came from a chain of events in late September 2026:
- Registrations accelerated sharply after President Trump’s September 22 speech at the UN General Assembly, where he said the U.S. government would use “Super Intelligence” and “SI”.
- On September 29, he signed Executive Order 14434, asking federal agencies to use “Super Intelligence” and “SI” in official correspondence, websites, reports, and other non-statutory documents.
Slovenia’s country code happens to match the new abbreviation. The registry reported a 2,199% jump in .si domain purchases in September. Netcraft found that new .si registrations overtook .ai ones within 25 hours of the UN speech.
The registry itself urged caution. Its spokesperson was careful not to attribute the whole surge to the president’s order.
.si vs .ai: A Useful Comparison
The comparison is natural, because .ai is also a country code domain. It belongs to Anguilla, a Caribbean territory. It became popular because AI companies built real products and brands on it.
The two are in very different positions:
| .ai | .si | |
|---|---|---|
| Country | Anguilla | Slovenia |
| Why it is popular | Matches “AI” and has years of proven use | Matches the new U.S. government term “SI” |
| Brand proof | Many established AI companies | Early stage |
| Typical cost | Relatively high | Relatively low |
| Main risk | High renewal costs | Depends on whether “SI” becomes common usage |
The future of .si depends on whether businesses actually adopt “super intelligence” in place of “artificial intelligence.” At the moment, that is one government’s choice of wording.
Should You Register a .si Domain?
Reasons it may be worth considering
- Brand differentiation. If you are building something around AI and your main audience is in the United States, a .si name can help you stand out.
- Low entry cost. Prices vary by registrar. One registrar quoted around $12 for the first year, compared with around $90 a year for .ai. The Slovenian registry reportedly charges registrars €10 per domain.
- Early momentum. The trend is new, and good short names are still available.
Reasons to be careful
- Low recognition. Many people do not associate .si with “super intelligence,” so you may need to explain your name.
- Uncertain future. The trend depends on a terminology change that may or may not spread beyond U.S. federal agencies.
- Trademark risk. Slovenia’s registry issued an advisory to businesses and trademark owners amid the surge. Registering another company’s brand name can lead to a dispute.
Can You Make Money Flipping .si Domains?
Yes, it is possible, but it is a gamble. Some sales have been public. For example, Recursive.si was sold for $20,000 to Recursive Superintelligence, a startup. Some premium names, such as ai.si, have reportedly been listed through brokers at very high asking prices.
Keep in mind that an asking price is not a sale price. A broker listing only shows what an owner hopes to receive, not what a buyer is willing to pay.
If you want to try domain investing, ask yourself three questions before you register anything:
- Is it memorable? Short, easy to spell, and easy to say.
- Can you picture a real company using it? A name with a clear business use has a better chance of selling.
- Have similar domains sold before? Past sales are the best evidence of demand.
According to one registrar’s analysis of new .si registrations on its platform, only about 3% included an AI-related term. Most were short, flexible names, the kind people register now and decide what to do with later.
The Hidden Costs of Domain Flipping
Before you start, remember the costs that reduce profit:
- Renewal fees. If a domain does not sell, you pay again every year.
- Marketplace commissions. Most marketplaces take a percentage of the sale.
- Time and patience. Many domains never sell.
- Legal exposure. Registering a name that matches someone’s trademark can lead to disputes, or to losing the domain.
How to Register a .si Domain
- Choose a registrar that supports .si domains and compare prices, including renewal costs.
- Search for your name. You will see right away whether it is available. If it is taken, try a variation.
- Add it to your cart and check the renewal price before paying.
- Enter your registration details and complete the purchase.
- Decide your plan: build a website on it, hold it, or list it on a domain marketplace.
Final Verdict: Is the .si Boom an Opportunity?
It depends on your goal.
- If you are building a real project, a .si domain can be a low-cost way to get a distinctive name, especially in the AI space.
- If you are flipping domains, treat it as speculation. Spend only what you can afford to lose.
Frequently Asked Questions
No. .si is Slovenia’s country code, and .ai belongs to Anguilla. They only look similar because of the “AI” and “SI” abbreviations.
Policies can change, so check the current rules with your registrar before buying.
Not in the near term. .ai has years of established use, while .si is still a new trend.
Search engines generally treat country code domains as geo-targeted, but that is not a reason to choose or avoid one. Content quality matters far more.