.si Domains: What They Are, How Registration Works, and How to Avoid Scams

Search traffic for .si jumped the same week Washington started saying Super Intelligence (SI) instead of artificial intelligence — the vocabulary shift in Trump's September 29 Super Intelligence executive order, not a new DNS zone. That overlap is accidental: .si is Slovenia's country-code domain, live since the 1990s. Treating it like a Super Intelligence vanity TLD is how people overpay, buy from impersonators, or register names they cannot legally use.

This guide is for builders, founders, and marketers who want a short, memorable domain — or who want to understand the hype — without falling for fake registrar pages and broker scams. explainx.ai did register explainx.si through Porkbun (see below); we still will not dump a list of checkout URLs for strangers on the internet. You should open the official registry site yourself, compare WHOIS, and pay only through a seller you chose deliberately.

TL;DR

Why .si is trending now (and what it is not)

Three different ideas get conflated in the same week:

1. Super Intelligence (SI) — US executive-branch vocabulary for the same broad tech category formerly called AI (see the rename poll that preceded the EO and the US-China SI Dialogue label).
2. Superintelligence — a narrow term in AI safety literature for hypothetical systems far above human capability (not the same as either SI acronym usage; see Bernie Sanders's Artificial Superintelligence Act).
3. .si — a two-letter ISO country code in the DNS, managed under Slovenian law.

Only the third is a domain extension you can register. Buying something.si does not give you a government endorsement, trademark rights in "Super Intelligence," or a special namespace beside .com, .ai, or .io. It gives you a Slovenian ccTLD label governed by Register.si rules and, if you misuse trademarks, exposure to alternative dispute resolution (ARDS).

If your goal is US federal-adjacent branding, .com / .ai / your existing product domain still match how customers search. If your goal is a pun (si as abbreviation in the second level, e.g. gets.si), understand you are buying Slovenian namespace, not policy namespace.

How the registry model works

ARNES runs the registry. Registrars — businesses under contract — sell to you and send transactions to the registry's automated system. You are the domain name holder; your contract is primarily with the registrar, but Register.si general terms override conflicting registrar fine print on core registration rules.

Mechanics that matter before you spend money:

• First-come, first-served. Complete applications are processed in arrival order. "Reserve this SI name for 24 hours with a deposit" from a random site is not the registry process.
• Holder data must be accurate. Holders owe correct natural vs legal person designation and contact details. WHOIS publishes holder-related data under registry WHOIS rules (natural persons get reduced publication for some fields, with options for functional email addresses).
• Renew or lose it. Unpaid names go to quarantine (DNS off) for up to 30 days, then deletion and possible re-registration by anyone.
• Registry lock — registrars can request a lock; material changes may require registrar-to-registry verification (including phone verification in documented procedures), which improves security but slows transfers.
• Disputes — blocked names can occur during ARDS or court cases; trademark and bad-faith registration complaints are a real risk for hype registrations (openai, anthropic, chatgpt, etc.).

As of public registry statistics cited on Register.si, on the order of 180k+ .si names and 80+ accredited registrars exist — a mature ccTLD, not an empty gold rush TLD.

Where to buy (without trusting this post's links)

Step 1 — Find the registry yourself. In a browser, search for Register.si and confirm you are on the ARNES national registry site (Slovenian academic/research network operator), not an ad or typo domain.

Step 2 — Open the accredited registrar list. The registry publishes a registrar page listing approved sellers with company names and their own websites. That list is the allowlist. If a shop is not on it, do not register there.

Step 3 — Compare a few accredited options. Registrars differ on price, UI, DNS hosting bundles, IDN support, and support hours. Typical patterns in the accredited set include EU-based domain wholesalers, Slovenian hosting providers, and global registrars with ICANN accreditation that also sell .si. Names you may see on the official list include providers such as INWX, OVH, EPAG, united-domains, 101domain, Spaceship, Dynadot (listed under a local trade name in registry data), NameWeb, Global Domain Group, NicNames, and multiple Slovenian hosting and telecom brands — always re-verify on the current list; accreditation changes.

Step 4 — Check availability using the registry's domain lookup tool on the same official site, then complete purchase on the registrar you picked from the list.

Step 5 — Confirm in WHOIS immediately after registration: the registrar field should match the company you paid. If WHOIS shows a different sponsor or the name stays "inactive" after you paid, open a ticket with that registrar and do not assume you own the name until WHOIS reflects it.

explainx.ai deliberately omits a registrar link farm so this page cannot be mistaken for an affiliate funnel or become a magnet for comment spam linking impersonators.

What we did: explainx.si via Porkbun

We are not writing this from the sidelines. After the SI acronym / .si confusion spiked, explainx.ai registered explainx.si through Porkbun — the ICANN-accredited registrar we already use for explainx.ai and other names. Checkout was normal card billing in a logged-in Porkbun account, not a crypto broker or a DM link.

You can check out the result live: explainx.si (short link to explainx.ai — our brand on Slovenia's ccTLD, not a Super Intelligence government product).

Three follow-ups we care about as builders:

1. WHOIS check. After Porkbun showed the name active, we confirmed WHOIS listed a sponsoring registrar consistent with Register.si's chain (retail brands like Porkbun often sit in front of an accredited .si backend). If WHOIS ever showed an unknown sponsor, we would have opened a ticket before pointing production traffic at the name.
2. Porkbun on the public Register.si list. The registry's accredited page lists legal registrar entities, not every retail storefront. Porkbun may not appear by brand even when the registration is valid. That is why WHOIS beats marketing copy.
3. Renewal calendar. .si quarantine is unforgiving (see above). Our renewal reminder is set early in the same Porkbun account so explainx.si does not become a typo-squatter prize in 2027.

Porkbun worked for us; it is one data point, not a universal rule. Compare renewal price and DNS tooling against other accredited options if you are shopping purely on cost.

Scam and abuse patterns to watch

Hype cycles breed the same domain scams with new ad copy — the same unofficial checkout pattern as fake Claude desktop malware lures, but for DNS. After SI policy news, watch for:

Fake registry or "official SI zone" sites

Cloned pages that mimic Register.si layout, use domains like register-si.com, si-domains.io, or superintelligence.si on non-accredited infrastructure. Real registry communication flows through accredited registrars and ARDS contacts documented on the real registry site — not Telegram support.

Brokers selling "premium" SI names off-market

Seller claims to hold gpt.si or superintelligence.si, demands wire or crypto, promises to "push" the name later. Without a registrar-mediated transfer visible in WHOIS, you may get nothing. Escrow only helps if the escrow service and the registrar transfer policy are real; crypto-only is a red flag.

Phishing after you search WHOIS

Scrapers email holders with fake renewal invoices. Always renew by logging into the same registrar account where you registered, not via email links.

Trademark bait

Registering obvious third-party marks to flip "to OpenAI" is both ethically toxic and legally exposed under ARDS-style dispute rules tied to Slovenian law and jurisdiction in Ljubljana. "I got the domain first" is not a business plan for .si.

Misleading SEO ads

"Sovereign Super Intelligence domain — only $2" may hide first-year promo pricing, mandatory bundles, or a non-accredited reseller. Read the total renewal price and the registrar legal name before checkout.

Confusion with .ai

Anguilla's .ai is a different ccTLD with different registry, pricing, and broker ecosystem. Sales copy that slides between .ai and .si in the same paragraph is often trying to confuse buyers.

Safe purchase checklist

1. Start at Register.si — lookup + registrar list — not a Google ad.
2. Pick three accredited registrars, compare renewal price (year two matters).
3. Pay with normal methods tied to a receipt and account login.
4. Enable registrar lock or registry lock if offered; use 2FA on the registrar account.
5. Set calendar renewal 30–60 days early; quarantine is unforgiving.
6. Use DNSSEC if your registrar supports it and you understand key rollover.
7. Do not publish a production app on the name until WHOIS and DNS delegation match what you expect.
8. EU consumers — registrars must disclose withdrawal rights; activating DNS may end the 14-day remote withdrawal window under registry consumer terms.

When .si is a reasonable choice

Good fits: Slovenian businesses, regional brands, pun domains where .si is part of the wordplay, projects that want an uncommon short TLD and accept Slovenian jurisdiction for disputes.

Poor fits: Pretending .si is the US government's Super Intelligence namespace, impersonating major AI brands, or expecting US customers to treat .si as default trust signal the way they treat .com.

For most US-facing AI products, your product domain + clear legal pages beats a speculative .si registration.

Technical and policy details builders ask about

Syntax: Latin letters, digits, hyphen; minimum two characters; some government labels reserved (e.g. emergency numbers and government labels per registry syntax rules).

IDN: Internationalized domains allowed per registry IDN table; ACE xn-- forms follow standard IDNA rules.

Transfers: Registrar change and holder change are separate transactions; locked or blocked names cannot skip dispute states.

Privacy: WHOIS is not anonymous by default for all fields; understand what publishes for legal vs natural persons before you register a personal email.

Law: Disputes fall under Slovenian law and Ljubljana jurisdiction between holder and registry — relevant if you are US-based and assume UDRP-only thinking. For broader US/EU policy context (not domain-specific), see the AI regulation guide.

Honest limitations of this guide

• explainx.ai registered one name (explainx.si via Porkbun); we did not benchmark every accredited seller. Pricing and UX change.
• Aside from explainx.si, Porkbun, and registry concepts, you must confirm the Register.si list at purchase time.
• This is not legal advice on trademarks or ARDS complaints.
• Scammers evolve faster than any static list; when in doubt, stop and verify WHOIS registrar against the official accredited list.

Bottom line

.si is Slovenia's ccTLD, not a Super Intelligence product from the White House. You buy through the accredited registrar chain (we used Porkbun for explainx.si), verify WHOIS, renew on time, and stay away from crypto brokers and fake registry sites. If the name is only valuable because of someone else's trademark, skip it — dispute policy and reputation cost more than the registration fee.

Related reading

• Trump's Super Intelligence executive order: what changes for builders
• Trump's AI rename poll and 70 years of rebrands
• US-China Super Intelligence Dialogue after Trump-Xi
• Fake Claude app and RevStealer crypto malware
• Agent skills security and verification
• AI regulation: EU AI Act and US policy

Registry rules, registrar accreditation, and scam patterns described here reflect Register.si general terms and public registry pages as reviewed in September 2026. Accreditation lists and prices change; confirm against the live registry before paying.