The .SI Domain Boom, Explained

.si is Slovenia's country-code domain — a quiet, 33-year-old piece of internet infrastructure that, through most of this year, added roughly 100 new addresses a day. In the ten days after September 22, 2026, that number went from about 100 to over 20,000 in a single 24-hour period.

The reason has nothing to do with Slovenia and everything to do with two letters. On September 22, President Trump told the United Nations General Assembly that the U.S. government would start calling artificial intelligence "Super Intelligence" — SI. A week later, he made it federal policy. Somewhere in between, domain investors noticed that Slovenia's country-code top-level domain is spelled exactly the same way.

Three questions matter here, and they have three different answers: Is .si actually becoming an official "Super Intelligence" domain? How much of this registration surge is real demand versus speculation? And is there anything about .si — beyond the letters-coincidence — that makes it a reasonable bet? This piece works through the primary sources (the executive order itself, Register.si's own numbers, and the independent research that's tracked the surge day by day) to answer all three.

What is the .SI domain?

.si is Slovenia's ccTLD (country-code top-level domain), delegated in the global domain name system since 1992. It's operated by Register.si, run under Arnes, Slovenia's academic and research network — the same kind of quasi-governmental registry structure most countries use for their national domain.

"SI" was never an abbreviation for anything related to artificial intelligence. It's simply the ISO country code for Slovenia, the same way "de" belongs to Germany and "jp" to Japan. The Super Intelligence association is a 2026 coincidence, not a rebrand — the registry itself has made no change to what the extension stands for.

Does .si officially mean Super Intelligence? No. Nothing in U.S. law, Slovenian law, or Register.si's own materials connects the two. The overlap is purely that the new American term for AI and Slovenia's country code happen to share the same two letters — the same kind of coincidence that made Anguilla's .ai valuable once "AI" became a hot term in the 2020s.

Why did .SI suddenly become popular?

The sequence, with dates:

1. Mid-September: Domain investors begin speculating on .si ahead of any formal announcement, apparently anticipating what Trump might say — Netcraft traced early registration activity back to around a September 19 Trump social-media poll about renaming AI.

2. September 22: Trump tells the UN General Assembly the U.S. will refer to AI as "Super Intelligence." Within 25 hours, daily .si registrations overtook daily .ai registrations, according to Netcraft's own tracking.

3. September 23–28: Registrations climb through the week; Register.si's own spokesperson later called the activity "unprecedented."

4. September 29: Trump signs Executive Order 14434, making "Super Intelligence"/"SI" official executive-branch terminology.

5. September 30: The first full day after the order, Register.si recorded roughly 11,000 new .si domains — more than three times the number the registry has publicly attributed to the entire month of August.

6. October 1–2: Daily registrations climb further (Netcraft measured over 13,000 in a 24-hour period); the order is formally published in the Federal Register on October 2.

7. Ongoing: A meaningful share of the surge is concentrated at a small number of registrars with resale marketplaces attached — covered in Section 6.

Don't take any of the per-day figures as exact or final — Section 4 explains why.

The registration timeline

Around September 4, 2026, an archived snapshot put the total .si domain count at roughly 190,000. For the full month of August 2026, Register.si recorded 3,515 new registrations — the pre-surge baseline. Between September 19–22, Netcraft traced early, speculative registration activity already underway, ahead of any formal announcement. On September 22, the day Trump told the UN the U.S. would call AI "Super Intelligence," nothing was reported yet for that date itself, but by September 23, Netcraft recorded 4,794 new .si registrations in 24 hours — enough for .si to overtake .ai on daily registrations for the first time. By September 28, Domain Name Wire put the total at roughly 219,000, a jump of more than 15% since the September 4 baseline.

September 29 was the day Trump signed Executive Order 14434 — no registration figure is tied to that date specifically. The day after, on September 30, a Register.si spokesperson reported roughly 11,000 new domains in a single day. On October 1, Netcraft measured over 13,000 new registrations in 24 hours, and Domain Name Wire put the full September total at 46,066 new registrations. October 2 was the day EO 14434 was formally published in the Federal Register (91 FR 63129). By October 3, CircleID and Domain Name Wire reported a total of 261,670 domains, with 12,399 new in 24 hours. Around October 5–6, one live reading cited by TheNextWeb showed 20,276 new registrations in 24 hours and a total of 298,682. As of October 6, 2026 — the day of this research — a live fetch of Register.si's own homepage showed a total of 288,116 domains, 15,073 new in the prior 24 hours, and 93 accredited registrars.

Reading the numbers correctly — and a live example of why that's hard

August → September: (46,066 − 3,515) / 3,515 × 100 = 1,210.6% — September produced 13.1 times as many new .si registrations as August, using the registry's own published monthly totals.

A different figure — a 2,199% increase, attributed to "Registry SI" — has also circulated, including in Forbes India's coverage. We could not find a published explanation of what exactly that figure measures (it's plausible it compares a different baseline, such as a daily rate rather than a monthly total), and no source we found reconciles it with the 1,210.6% figure computed directly from the registry's own month-over-month data. We're reporting both rather than picking one, because silently choosing the more dramatic number would be exactly the kind of unearned precision this story doesn't need.

The counter itself is genuinely unreliable to cite from a cache, and we can demonstrate this rather than just assert it. During this research, a direct fetch of Register.si's own homepage returned a statistics widget reading 191,348 total domains, 3,515 new in the last month, and 148 new in the last 24 hours — figures matching the pre-surge August baseline, not the tens of thousands of new registrations every independent outlet was reporting for the same week. That's either a stale cache or a slow-to-update snapshot being served to at least some visitors — and it's a real, first-hand illustration of why a single screenshot of this counter, without a timestamp, shouldn't be treated as authoritative. If you're citing a live .si total anywhere, timestamp it and say so.

Scale, in plain terms: before September 22, .si was adding roughly 100–113 domains a day. By the first days of October, multiple sources independently put the daily rate between 12,000 and 20,000+ — on the order of 100 to 150 times the pre-surge baseline.

.si vs. .ai during the same window: a separate measurement (Domaintechnik/DomainNameStat, via CircleID, using its own zone-count methodology rather than Register.si's official figures) found 17,621 new .si registrations in the week of September 23–29, versus 7,209 new .ai registrations — .si growing at roughly 2.4 times .ai's rate that week. Note this is a different measurement method than the registry's own counts above, so don't average the two together.

Worth separating, because the coverage of this story often doesn't: a registration is not a sale. A domain appearing in the registry's count means someone paid a registrar a small annual fee — it does not mean the name changed hands for money, or that a business is using it for anything. Section 6 is specifically about that distinction.

Is the boom real — or is it speculation?

Both, and the evidence lets us say roughly how much of each.

The registration numbers themselves are real, independently confirmed by the registry's own statistics, Netcraft's own crawl-based measurement, and multiple news outlets working from different data sources. Nobody disputes that tens of thousands of new .si domains have been registered.

What's much thinner is evidence of actual business adoption. Domain Name Wire's October 1 reporting states plainly that it saw no evidence yet of adoption by real operating companies, citing a tracker of ProductHunt launches that found zero startups launching on a .si domain in the 30 days before October 1 — despite .si costing a fraction of .ai. TechCrunch separately reported that Hostinger, one of the larger registrars seeing .si volume, found only about 3% of its customers' .si registrations were explicitly AI-related — meaning the overwhelming majority of the volume isn't even nominally about Super Intelligence at all, consistent with generic speculative registration of short, memorable names rather than a wave of branded AI launches. Hostinger did note that buyers from the U.S. and India accounted for more than half of its recent .si registrations.

The clearest evidence of speculation is registrar-specific. Netcraft found that just over half (roughly 52%) of the .si domains registered through Dynadot — a registrar with its own built-in resale marketplace — in the days before Trump's UN speech were already listed for resale on that same marketplace: registered to flip, not to build. After the executive order, Netcraft identified a second wave concentrated at OpusDNS, a registrar that markets specifically to domain resellers and had only just added .si support days earlier. Asking prices at the speculative end are aggressive — reporting on the boom has cited names like build.si and seed.si listed around $10 million and $8 million respectively, and Netcraft found more than 44,000 .si registrations that duplicate the name of an existing .ai domain, which is a fairly unambiguous tell for pattern-based speculation rather than organic naming.

A related, separate pattern worth knowing about, outside .si entirely: Netcraft identified 87 .com domains combining well-known brand names with the word "superintelligence" — examples named include variations on Fox, Disney, and Discord — registered in two batches hours before the executive order was signed, each listed for resale around $20,000. This looks like brand-name squatting by people anticipating the announcement, not a .si-specific phenomenon, but it's directly relevant to anyone evaluating how much of this moment is opportunism versus genuine interest.

One more thing worth naming plainly, because it's being reported and it bears on the "who benefits" question: a policy commentator, Adam Cochran, has publicly alleged — as reported by IBTimes UK — that people with advance knowledge of the renaming plan bought up .si domains before the announcement and profited as demand surged, characterizing it as deliberately enriching figures connected to the administration. This is an allegation, not an established finding, and we found no independent confirmation of it beyond the documented timing of registrations around Trump's September 19 social-media poll and the September 22 speech. Register.si's own spokesperson, for her part, has publicly said she's cautious about attributing the entire registration surge to Trump specifically. We're flagging the allegation because it's part of the public record on this story, not because we can verify it.

Net read: the registration boom is real and well-documented. The adoption story — operating businesses actually building on .si — is, as of this writing, thin. That's a materially different and more precise claim than ".si is the new .ai," and it's the one the evidence actually supports.

si vs. .ai

Registry: .si is run by Register.si (Slovenia, via Arnes); .ai is run by the Government of Anguilla.

Minimum term: .si has no minimum — registrations can run a single year. .ai carries a registry-mandated two-year minimum, so there's no such thing as a one-year .ai registration anywhere.

International eligibility: Both are open to anyone, in any country, with no residency requirement.

Example pricing (varies by registrar): .si runs roughly $12–22/year at near-cost registrars, up to $126+/year at markup registrars. .ai runs roughly $65–95/year-equivalent at at-cost registrars, and $150–200/year-equivalent at retail registrars. These are illustrative snapshots gathered during this research, not fixed market prices — check current rates before registering.

Approximate installed base: .si sits around 288,000–300,000 domains as of October 2026 (see the counter caveat above). .ai sits around 1.28 million as of mid-2026 — still roughly 4–4.5x .si's base.

History as a tech/AI brand: .si had none before September 2026. .ai has been established as an AI-associated extension since the early-2020s AI boom.

Pricing figures above are illustrative examples gathered from registrar listings during this research, not fixed market prices — registrars are actively repricing a trending TLD, so treat any specific number as a snapshot, and check current pricing directly before registering.

The structural reason .ai prices look different isn't just markup: .ai has a registry-mandated two-year minimum, so there's no such thing as a one-year .ai registration anywhere — any "per year" .ai price you see is a two-year total divided by two. .si has no such minimum.

What a 10-year registration might cost — an illustrative calculation

Using published prices gathered during this research as examples (not guaranteed current rates):

.si, budget registrar example (~$12.12 register, ~$13.59/yr renewal): 10 years ≈ $12.12 + ($13.59 × 9) = $134.43

.ai, at-cost registrar example (~$134 per 2-year block): 10 years ≈ $134 × 5 = $670

.ai, retail/markup registrar example (~$320 per 2-year block): 10 years ≈ $320 × 5 = $1,600

On these illustrative numbers, a 10-year .si registration costs roughly 8–20% of a comparable 10-year .ai registration, depending on which .ai registrar tier you compare against. That's a genuinely large cost gap, and a defensible reason .si could attract interest independent of the SI coincidence.

What this calculation does not tell you: a lower acquisition cost says nothing about resale value, brand recognition, or whether .si will be worth anything in five years. Cheap and valuable are different claims. Treat this as an ownership-cost comparison, not an investment projection.

Who can actually register a .SI domain?

No residency requirement, no citizenship requirement, no requirement to operate a Slovenian company. Register.si's own General Terms and Conditions define a domain holder simply as "a natural or legal person" — no nationality or establishment test anywhere in the document. You can't register directly with the registry itself; it has to go through one of its accredited registrars (93 as of this research, up from 91 before the surge).

A few mechanical rules worth knowing: registrations run 1–5 years, names must be 2–63 characters, there's a 16-day cancellation window (only if the domain hasn't been activated yet — i.e., nameservers not pointed), and a 30-day post-expiry quarantine before a dropped name becomes available again.

One underreported wrinkle: dispute resolution through .si's own ADR process is limited to rights recognized under Slovenian law — a U.S. or other non-Slovenian trademark holder may have a weaker position there than they'd assume from experience with .com disputes.

A caveat we're flagging rather than asserting: some domain-advisory sources claim Google's search systems treat ccTLDs like .si as geo-targeted to their country by default, unlike .ai, which despite technically being Anguilla's ccTLD has been treated more like a generic domain in practice given its overwhelmingly non-Anguillan usage. If accurate, this could mean an SEO disadvantage for a non-Slovenian business running its primary site on .si. We found this claim only in secondary domain-advice content, not in Google's own documentation, so we're presenting it as an open question worth checking against Google's Search Console documentation before you build a strategy around it — not as settled fact.

Is .si officially connected to Super Intelligence?

No. This is worth stating as cleanly as possible: .si remains, legally and technically, Slovenia's country-code domain — nothing more, nothing less. Nothing in Executive Order 14434, the Federal Register, or Register.si's own materials creates any formal connection between the two. What's happened is a market reaction to a letters coincidence, the same pattern that made .ai a sought-after extension once "AI" became commercially hot, now repeating itself around a different two-letter match. It's also worth noting, as several outlets have, that Slovenia carries an additional point of cultural resonance here independent of the SI coincidence: it's the birthplace of First Lady Melania Trump — a detail that's generated commentary but has no bearing on the domain's legal status.

What Executive Order 14434 actually changed

Covered in full depth in our companion piece (next section), but briefly: signed September 29, 2026, published in the Federal Register October 2, 2026. It directs federal executive agencies to use "Super Intelligence" and "SI" instead of "Artificial Intelligence" and "AI" in their own communications, "to the maximum extent permitted by law." It defines SI as meaning exactly what existing federal law (15 U.S.C. § 9401(3)) already defines as "artificial intelligence" — a terminology change, not a new legal category. It does not rename the .si domain, does not bind private companies, and does not alter any existing regulation, contract, or statute on its own. A 60-day clause in the order sets up a possible second news cycle around late November 2026 — see our companion article for why that date matters.

What the .SI boom does not prove

Worth stating directly, because hype tends to blur these into one claim:

• It does not prove AI has been renamed worldwide — the order governs U.S. executive-branch communications only.

• It does not prove "SI" has replaced "AI" as a technical term — see our companion piece on why SI and the research community's "artificial superintelligence" (ASI) are different concepts entirely.

• It does not prove .si will replace .ai — the installed base gap (roughly 4–4.5x in .ai's favor) and the thin adoption evidence above both argue against assuming that.

• It does not prove .si domains will rise in value — a registration boom is not a valuation.

• It does not prove startups are adopting .si — the ProductHunt evidence above points the other way, so far.

• It does not guarantee domain investors profit — speculative booms built on reseller activity can and do reverse.

Should you register a .SI domain?

Not financial advice — a decision framework instead.

Worth considering if:

• The name has genuine brand value to you independent of the SI trend

• It's directly relevant to what you're building

• You understand and budget for renewal costs beyond the first year

• You're comfortable with the risk that "Super Intelligence" as a term may not stick commercially

• You're building something the Super Intelligence framing genuinely fits, not retrofitting a name to the news cycle

Worth being cautious about if:

• Hype is the only reason

• You're registering many names in bulk hoping one appreciates

• The renewal cost isn't sustainable if the name doesn't pan out

• You're assuming registration alone creates value — the adoption evidence above says it doesn't, yet

Conclusion

The .si boom is real as a registration phenomenon — the numbers are large, independently confirmed, and genuinely unprecedented for this registry. But registration growth, business adoption, and domain investment value are three separate things, and right now the evidence strongly supports the first while barely supporting the second and saying nothing reliable about the third. The more interesting question than "is this real" is what happens once the initial speculative wave settles — whether genuine SI-branded products show up on .si addresses, whether the term "Super Intelligence" gains any traction outside federal paperwork, and whether Register.si's own promise to keep publishing updated data holds. We're treating this as a living page and will revisit the numbers as the picture develops.

References

• Federal Register, Executive Order 14434, 91 FR 63129 (Oct. 2, 2026)

• Register.si, official site and statistics

• Netcraft, "Slovenian .SI Domain Registrations Outpace .AI After Trump's 'Super Intelligence' AI Rename" (Sept. 24, 2026) and "'Super Intelligence' Executive Order Fuels Nearly Hundredfold Increase in .si Domain Registrations" (Oct. 1, 2026)

• Domain Name Wire, "Who is buying .si domain names?" (June 11, 2026), "Slovenia's .si domain grows more than 15% in wake of Trump's UN speech" (Sept. 28, 2026), "46k .si domains registered in September, momentum growing after Trump's executive order" (Oct. 1, 2026)

• TechCrunch, Oct. 2, 2026 coverage of the .si registration surge

• Forbes India, "Why Slovenia's .si extension is suddenly attracting speculators"

• IBTimes UK, reporting on Adam Cochran's allegations regarding advance-knowledge domain purchases

See our companion piece, "Is AI Now Called 'SI'? What Executive Order 14434 Actually Says," for the full legal and terminology breakdown.