What Is a .si Domain, and Should You Buy One for an AI Brand?
By Ashikur Rahman17 min readQuick answer: .si is the country-code domain of Slovenia, run by the Slovenian research network ARNES. It is being sold as "super intelligence" because Donald Trump told the UN on 22 September 2026 that AI would be called SI, then signed an order on 29 September telling US agencies to use the term. Registrations jumped: the registry counted 46,066 new .si names in September against 3,515 in August. But Google still treats .si as a Slovenian domain. It is not on Google's list of 20 country codes it reads as global, the way .ai and .io are.
Where did the .si rush come from?
It came from a name change, in three steps over ten days. Each step is worth separating, because the marketing around .si blurs them into one.
On 19 September 2026, Trump posted a poll on Truth Social offering alternative names for artificial intelligence. Netcraft, which tracks domain registrations, timestamps the poll at 15:29 UTC. Sources disagree on the exact options in it, so they are not repeated here.
On 22 September he addressed the UN General Assembly. The White House release of the speech calls AI "the Artificial Intelligence being spoken of so much now - hereinafter officially called 'Super Intelligence.'" As delivered, according to a commercial transcript by Rev, he added: "So it's Super Intelligence. In other words, welcome to the new world of Super Intelligence-SI." He later added: "Let's see if I have any power. Maybe I do, and maybe I don't." I found no full official transcript of the speech when I checked on 2 October 2026.
On 29 September he signed an executive order titled "Inaugurating the Era of Super Intelligence". This is the only part that binds all executive agencies. Section 2(a) says agencies "shall use "Super Intelligence" and "SI" in place of "Artificial Intelligence" and "AI" in official correspondence, public communications, websites, reports, policy documents, and other non-statutory documents within the executive branch." It applies "to the maximum extent permitted by law", and section 2(b) leaves existing regulations, contracts and grants untouched.
| Date (2026) | What happened | Who it binds |
|---|---|---|
| 19 September | Truth Social poll on new names for AI | Nobody |
| 22 September | UN speech: AI "hereinafter officially called" Super Intelligence | Nobody directly |
| 22 September | State Department email "Change in Nomenclature AI to SI" | One State Department bureau |
| 29 September | Executive order, "Inaugurating the Era of Super Intelligence" | US executive branch agencies |
| 2 October | Order not yet in the Federal Register, no order number | Unchanged |
Read the "Who it binds" column before you read any domain ad. Hostinger's .si banner says "AI is now called superintelligence". That is true inside the US executive branch's own documents, and nowhere else. No company, foreign government, search engine or domain registry is bound by the order. Whether the rest of the world adopts "SI" is an open question, and the speech itself admitted it: "Let's see if I have any power."
How many .si domains have been registered since the speech?
The registry publishes a live counter on its home page, and that counter is the only number you can check yourself. I read it at 05:28 UTC on 2 October 2026 and compared it with an archived reading from a month earlier.
| Registry counter | 4 September 2026 | 2 October 2026 |
|---|---|---|
| .si domains registered | 190,893 | 250,769 |
| New in the previous month | 3,515 (August) | 46,066 (September) |
| New in the last 24 hours | 157 | 12,860 |
| Accredited registrars | 91 | 92 |
The arithmetic: 250,769 minus 190,893 means the total grew by 59,876 in four weeks, a rise of 31.4%. September's 46,066 new registrations are 13.1 times August's 3,515. On 4 September the counter's 24-hour figure read 157. On 2 October it read 12,860.
ARNES gave Foreign Policy its own day-by-day view: "more than 2,000" new registrations on the day of the speech and "more than 4,000 the day after". Netcraft read the same counter on 23 September and saw 4,794 in the previous 24 hours. Netcraft also reports that daily registrations more than doubled again after the executive order was signed.
Why the numbers in most articles do not match the registry
Figures repeated by several outlets this week are 3,234 new .si names the day after the speech, 17,621 .si names against 7,209 .ai names in the following week, and a total that grew from 241,846 to 262,319. None of them comes from the registry. They come from domainnamestat.com, a third-party counting site, as analysed by the Austrian registrar Domaintechnik and then repeated by Trending Topics and Domgate.
Domaintechnik says so itself. It sets the registry's 230,292 on 30 September next to domainnamestat's 262,353 and notes that the counting methods differ. On every date where both are available, the third-party total is higher. The 3,234 figure is also lower than ARNES's own "more than 4,000" for the same day. So if you are citing a number, cite the registry's counter and say when you read it.
One more caution comes from the registry. Its spokesperson, Klara Herman, told Foreign Policy: "We would, however, be careful about attributing the entire increase to President Trump's comments. The upward trend was already there before the recent attention around 'SI.'" Registrations had already risen in May 2026, months before the speech.
Who is buying .si domains?
Early evidence points to domain investors more than website builders. Nobody has a complete answer, because .si has no obligation to publish its zone file and the registry says it only sees which registrars are busiest. But three measurements point the same way.
- Resale listings. Netcraft found that about 52% of the .si names it detected being registered at the US registrar Dynadot, between the poll and the speech, were already listed for resale on Dynadot's marketplace by 23 September.
- Copies of .ai names. Netcraft counted more than 44,000 registered .si names that match an existing .ai name letter for letter. That was 22% of all .si domains at the time of its count.
- Sales before the rush. Domain Name Wire looked at the 35 .si sales recorded on NameBio from January to 9 June 2026 and wrote: "Only two domain names stand out as end user purchases." One was Recursive.si, bought for $20,000 by an AI company that redirects it to its main .com site.
The registry adds that most of its ten busiest registrars last month were foreign. Hostinger's head of domains told Foreign Policy: "Nearly all of our .si orders are new registrations, not transfers from other providers." Both fit the same picture. Both suggest new names, largely through foreign registrars, rather than existing sites moving.
None of this makes a .si name a bad buy for you. It does mean the rush is, so far, driven at least as much by investors as by people building websites. A working site on .si is an opening. It is also a reminder of how much of the .si story rests on speculation rather than use.
Does Google treat .si like .ai or .io?
No. This is the fact the domain ads leave out, and it matters more than the price.
Google's guide to managing multi-regional and multilingual sites says country-code domains "provide a strong signal to both users and search engines that your site is explicitly intended for a certain country." It then names the exceptions, the country codes it treats as global because "users and website owners frequently see these more generic than country-targeted". The list, verbatim, is: ".ad .ai .as .bz .cc .cd .co .dj .fm .io .la .me .ms .nu .sc .sr .su .tv .tk .ws". That is 20 domains. .si is not one of them. The page was last updated on 10 December 2025, and the list still read the same on 2 October 2026.
So to Google, a site on .si is a site for Slovenia. That does not stop it being indexed or ranking elsewhere. It is one signal among several, and a strong site can rank outside its country. But it starts with a hint pointing the wrong way for anyone selling to the US or the UK.
Can you tell Google your .si site is for the US instead?
Not through Search Console any more. Search Console used to have an International Targeting setting. Google's help page now says: "The International Targeting report has been deprecated. Google will continue to support and use hreflang tags on your pages. However, the ability to target search results to specific countries using Search Console country targeting was determined to have little value for the ecosystem, and is no longer supported." Google removed it in 2022. Hreflang tells Google which language or country version of a page to show. It does not turn a country-code domain into a global one.
Could .si join the generic list, the way .ai did?
It could, but Google publishes no way to apply. .ai was not always on the list. Google's search documentation changelog records the date: "May 30: Added .ai to the list of TLDs that Google Search treats as a global TLD (gTLD)." That was 30 May 2023. Google's stated reason for any addition is how users and site owners see the domain, and the page says "this list may change". It publishes no request process and no threshold.
.si has a harder case than .ai had. It is the working domain of a real country, used by Slovenian businesses and public bodies, and the registry even reserves si.si and rs.si for the government. Google would have to decide that this local use no longer defines the domain. Until it says so, plan for .si being read as Slovenian.
Is there a ranking boost for a keyword in the domain extension?
No. In a 2015 post on Google's Search Central blog, which now carries a note that some of it may be outdated, John Mueller wrote: "Keywords in a TLD do not give any advantage or disadvantage in search." A .si ending does not tell Google your site is about superintelligence, just as .london does not make a site about London. The same post states the default for country codes plainly: "most ccTLDs (with exceptions) result in Google using these to geotarget the website".
Work with me
Thinking of building on a .si, or already bought one?
A cheap domain bought in a news week can become a good brand or a quiet handicap, and which one depends on where your customers are. Google reads .si as a Slovenian address, so a site that sells in the US, the UK or across Europe has to be set up with that in mind. Getting it wrong costs nothing on day one and a lot of ranking time later.
Send me the domain, what you plan to put on it and the countries you sell to. I will tell you whether it can carry your main site, whether it should redirect to a domain Google treats as global, and how to wire the two together without duplicate pages. If the honest answer is to keep it parked, I will say so. The first look is free.
Ashikur Rahman
SEO and AI Search Specialist
The contact links above go to me directly, so I earn from it if you hire me. Nothing else on this page is a paid placement.
Do AI answer engines care about the domain extension?
None of them has said so, either way. For Google's own AI features, the guide to AI features and your website says: "There are no additional requirements to appear in AI Overviews or AI Mode, nor other special optimizations necessary." To be shown as a supporting link, a page must be "indexed and eligible to be shown in Google Search with a snippet". The page does not mention domain extensions. I found no published statement from OpenAI, Perplexity or Google's Gemini on whether a domain's ending affects which sources get cited.
None of these engines gives a reason to expect the extension to matter. The guides on ranking in Google's AI Overviews and getting cited by ChatGPT cover what does matter.
The catch is Google's AI Overviews. They draw their supporting links from pages eligible in Google Search, so any disadvantage a .si site has in Google's ranking for US queries can carry over to its chances of being cited there. Nobody outside Google can measure that cleanly. If you build on .si and want to know whether AI engines mention you, the honest approach is to track it rather than assume it. The comparison of AI visibility tool pricing shows what that tracking costs.
How much does a .si domain cost compared with .ai?
A fraction. The registry charges every registrar a flat 10 EUR per year, and each registrar sets its own retail price on top. The registry says it has no say over that price. These are the US-dollar prices on each registrar's own page on 2 October 2026.
| Registrar | .si first year | .si renewal | .ai first year | .ai renewal |
|---|---|---|---|---|
| Hostinger | $11.99 | $16.99 | $89.99 | $109.99 |
| Dynadot | $12.04 | $13.50 | $85.60 | $85.60 |
| Porkbun | $17.64 | $17.64 | $82.70 | $82.70 |
| Gandi | $126.00 | $215.98 | $112.06 | $179.76 |
Porkbun's $17.64 is a sale price against a regular $23.70. Gandi's prices exclude tax. Every .ai price comes with a two-year minimum term, while .si can be bought for one year. I could not read Namecheap's or GoDaddy's .si prices, because both sites blocked automated access and no archived copy exists, so they are left out rather than guessed.
A worked example: four years of ownership
First-year prices flatter every domain, so compare what you would pay to hold the name for four years: one registration plus three renewals.
- Hostinger: .si costs $11.99 + 3 x $16.99 = $62.96. .ai costs $89.99 + 3 x $109.99 = $419.96. The gap is $357.00.
- Dynadot: .si costs $12.04 + 3 x $13.50 = $52.54. .ai costs 4 x $85.60 = $342.40. The gap is $289.86.
- Porkbun: .si costs 4 x $17.64 = $70.56, assuming its renewal sale holds. .ai costs 4 x $82.70 = $330.80.
- Gandi: .si costs $126.00 + 3 x $215.98 = $773.94, more than every .ai option above.
Two points come out of that. First, .si is cheap almost everywhere, and the cheapest four years in this table is Dynadot's $52.54, not the advertised $11.99. Hostinger's renewal is $5.00 a year above its first-year price. Second, the registrar matters more than the extension: Gandi's $215.98 renewal is many times the registry's 10 EUR fee. Read the renewal price before you click buy.
What are the rules for registering a .si domain?
They are simple, and open to buyers outside Slovenia. The registry's general terms set them out:
- Who can register: any "natural or legal person". There is no residency clause, and foreign registrars are accredited.
- Where: only through a registrar. You cannot buy directly from the registry.
- How long: registrars register or renew for one, two, three, four or five years. Some registrars offer less; Hostinger's maximum is three years.
- Who gets a name: first come, first served. There is no premium tier, and the registry announced no price change during the rush.
- Length: 2 to 63 characters. Names with accented letters are allowed.
- Change of mind: a new holder can cancel within 16 days of registration if the domain has not been activated.
- Reserved names: 112.si, 113.si, si.si and rs.si are held for Slovenian public bodies.
One rule matters more than the rest if you own a brand. Disputes over .si names go through the registry's own process, ARDS, not the UDRP process that covers .com. The general terms limit complaints to rights recognised in Slovenia, such as a trademark "valid on the territory of the Republic of Slovenia". If someone registered your brand name on .si this month and your trademark is only American, your route to getting it back is much narrower than it would be on .com. The registry's own advice is that brand owners without a .si should register one soon.
When does a .si domain make sense?
It depends on what the domain has to do. The table below is the decision as I would make it for a small business or a solo brand.
| What you want | Verdict | Why |
|---|---|---|
| Protect your brand name | Yes, buy it | Cheap, and disputes are harder on .si than on .com |
| A short link or campaign address | Yes | Redirect it to your main site; no ranking needed |
| A business selling in Slovenia | Yes | The country signal works in your favour |
| Main site for US or UK customers | Not yet | Google reads .si as Slovenian; use a global domain |
| A copy of your .com on .si | No | Duplicate pages split signals and help nobody |
| A resale investment | Your call | It rests on "SI" sticking; about half of one registrar's early names were listed for resale |
The middle rows are where people get hurt. A second domain that repeats your main site's pages splits your signals between two copies. Several near-identical sites pointing visitors to one place can also start to look like the doorway pattern in Google's spam policies. The September 2026 spam update explainer walks through those policies. A redirect avoids the problem. Point the .si at your real site, and you keep the name without asking Google to rank two versions of it.
If you want an AI brand on .si anyway, build something on it that earns links on its own: a tool, a dataset or research people cite. A site that depends on Google traffic from the US is starting at a disadvantage. A site that earns links and citations depends far less on what Google assumes about its country.
The short version
.si is Slovenia's domain, and "SI for super intelligence" is a name the US executive branch must now use in its own documents, under an order signed on 29 September 2026. That order binds nobody else. The registry's counter shows a real rush: 46,066 new names in September against 3,515 in August, and 250,769 in total on 2 October. Different numbers in some coverage come from a third-party counter, not the registry. Early evidence points to investors: about half of one registrar's early .si names were listed for resale within days.
The fact that should decide your purchase is Google's. It lists 20 country codes it treats as global, and .si is not one of them, so a .si site still tells Google it is for Slovenia. At $52.54 to $70.56 for four years at the cheaper registrars, a .si is a sensible way to protect a brand or run a redirect. Do not make it your main site for customers outside Slovenia unless Google adds it to that list.
Frequently asked questions
What is a .si domain?
.si is the country-code top-level domain of Slovenia. It is run by Register.si, part of ARNES, the Academic and Research Network of Slovenia. Anyone, in or outside Slovenia, can register a .si name through one of 92 accredited registrars. Since September 2026 it has been widely marketed as standing for "super intelligence", after the US government started using SI in place of AI.
What does .si domain mean?
Officially, .si means Slovenia, from the country's own name for itself, Slovenija. The "super intelligence" meaning is a marketing reading that registrars widely adopted after Donald Trump told the UN on 22 September 2026 that AI would be called SI. Google and the registry still treat .si as Slovenia's domain.
What country is the .si domain?
Slovenia. Google's documentation says country-code domains are a strong signal that a site is meant for that country. Google treats 20 country codes as global, including .ai, .io and .co, but .si is not on that list, so Google reads a .si site as Slovenian.
Why are people buying .si domains?
Because the US government now uses "Super Intelligence" and "SI" in place of "AI". A speech on 22 September 2026 announced the change and an executive order on 29 September made it binding on federal agencies. Domain investors are betting that SI catches on the way .ai did. Netcraft found that about half of one registrar's early .si registrations were listed for resale within days.
How much does a .si domain cost?
On 2 October 2026, a .si domain cost $11.99 for the first year at Hostinger (renewing at $16.99), $12.04 at Dynadot (renewing at $13.50) and $17.64 at Porkbun. Gandi charged $126.00. The registry itself charges registrars a flat 10 EUR a year, and each registrar sets its own retail price.
Is a .si domain good for SEO?
For a site aimed at Slovenia, yes. For a site aimed at the US, the UK or a global audience, it is a handicap, because Google treats .si as a Slovenian country-code domain and Search Console no longer lets you override country targeting. A .si name gives no ranking boost for the word "super intelligence" either.
Will Google treat .si as a generic domain like .ai?
Not as of 2 October 2026. Google added .ai to its generic list on 30 May 2023. Google says its list "may change" and bases it on how users and site owners see a domain, but publishes no application process or threshold. Plan around the current list rather than a possible future one.
Can a foreigner register a .si domain?
Yes. The registry's general terms allow any natural or legal person to hold a .si name, with no residency requirement, and foreign registrars are accredited. You must register through a registrar, for one to five years. Names are first come, first served, and there is no premium price tier set by the registry.
Should I buy the .si version of my brand name?
If your brand matters to you, it is cheap protection. Disputes over .si names are handled by the registry's ARDS process and limited to rights recognised in Slovenia, so a US-only trademark gives you a weaker claim than on .com. Register it and redirect it to your main site rather than building a second copy.
How many .si domains are registered?
The registry's counter showed 250,769 .si domains on 2 October 2026, up from 190,893 on 4 September. It counted 46,066 new registrations in September against 3,515 in August. Higher totals quoted elsewhere come from third-party counters, which the registrar that published them says count differently.
Transparency: every quotation and figure was read on 2 October 2026 from the White House, Register.si and its live counter, Google's Search Central documentation and Search Console help, each registrar's own price page, the Rev transcript, and the Netcraft, Foreign Policy, N1, Domain Name Wire and Domaintechnik reports named above. Where a source publishes nothing, or a site could not be read, this article says so rather than substituting an estimate. Ashikur Rahman sells SEO and website services, which is a commercial interest you should weigh. CriticNest earns a referral commission from Hostinger on some other pages; this page carries no affiliate or tracking links.
