.si Domain

Because the letters SI match the initials of Super Intelligence, even though .si is officially Slovenia's country code extension. The link grew stronger in September 2026: on 22 September the US President told the UN General Assembly that AI would henceforth be officially called “Super Intelligence”, and the registry, Register.si, reported that this naming debate boosted interest in .si. Time will tell how far the term spreads, so a name that works in both readings, Slovenian and AI, lowers your risk.

Both are two-letter country code extensions, but each follows a different country's registry rules. .ai belongs to Anguilla and its registry authority is the Government of Anguilla; .si belongs to Slovenia and is run by Register.si within ARNES. .ai has long been the established address of AI projects, while .si came into focus in 2026 through the Super Intelligence (SI) reading, and in September 2026 the registry announced that registered names had passed 200,000. You do not have to treat them as rivals: register your brand in both and point one at the other. To compare, have a look at the .ai domain page too.

No. .si is not on Google Search Central's list of country-code extensions that Google treats like generic domains (gccTLDs), whereas .ai, .io and .co are. Google says a country code domain gives users and search engines a strong signal that a site is meant for a specific country, and a .si address sends that signal for Slovenia. For a business selling in Slovenia that is an advantage. If your superintelligence project speaks to a worldwide audience, also register the name on an extension Google treats as generic, such as .ai, and decide early which address you will use for international search.

No. The registry's General Terms accept any natural or legal person as a holder and ask for no nationality, residence or address in Slovenia. A company outside Slovenia, an AI team in another country and a private individual all register on the same footing. What is checked is your contact detail: at every new registration and renewal the registrar verifies your email address or phone number, both for correct format and for actually working. If verification still fails after an extra deadline, the registry may deactivate or delete the name, so keep that mailbox live.

Search for the name, choose a registration term and complete the order; no Slovenian company or residency is needed. If the .si name you want is free on the domain name search page, add it to your cart, pick the term and pay. Because .si registrations verify your email address or phone number, enter contact details you can always reach. The name is activated once its name servers are submitted to the registry, and from then on your site or AI product opens at that address.

Yes, if the name matters to your AI brand: .si registrations are first come, first served, so waiting means risking the name going to someone else. In September 2026 the registry itself advised owners of trade marks, company names and slogans without a .si name to register as soon as possible. If someone else gets there first, the route through the registry is the ARDS dispute procedure, but it requires a right recognised under Slovenian law, such as a trade mark valid in Slovenia or a company name in the Slovenian court register, and it runs in Slovenian. Some names are off the table anyway: si.si and rs.si are reserved for the Slovenian government. Check your name on the domain name search page.

You get a 30-day window. If no renewal request arrives, the name is put into quarantine on the day the period ends: the registry removes the pointers from the .si zone servers, so your website and email stop working at that moment. The General Terms state that quarantine may not last longer than 30 days, and a renewal within that window clears the status and reactivates the name. After 30 days the name is deleted and anyone may register it. The grace period plus separate redemption period familiar from many generic extensions does not exist here: there is one window, and your service is already down throughout it. Renew before the expiry date so you never reach it.

Not in the registry's public lookup. In our query on 25 September 2026 the whois output showed only the domain name, the registrar, the name servers, the status and the dates; the holder field carried an opaque handle and a “NOT DISCLOSED” note. Under the General Terms only the email address of a natural-person holder is published, and you may give a functional mailbox that contains no personal data instead of your private address. Third parties can obtain the data through a substantiated request with a justified reason, such as enforcing legal rights or an ARDS complaint. Check your record on the whois search page.

A change of registrar for .si works with a password: you give your current registrar the SHA-256 digest of a password you choose, the registrar writes that digest into the name's authorisation field, and you hand the original password to the new registrar. The registry publishes a tool that produces the digest locally in your browser, so the password never travels over the network. The General Terms state explicitly that a change of registrar does not alter the registration period. A change of holder is a different procedure and needs the consent of both the outgoing and the incoming holder; the registry emails both parties automatically once it completes. Start on the domain transfer page.

Yes, both. The registry deployed DNSSEC on 1 December 2011 and completed the chain of trust on 24 December 2011; you can submit the signature digest for your own name through your registrar. Use is optional, but on a signed name expired signatures, or DNSSEC switched off without telling the parent zone, stop the address resolving at all. There is also a Registry Lock: once it is active no change other than renewal is possible, and to lift it the registry calls your registrar's designated person to verify the request, only during office hours. For a valuable superintelligence or brand name, that extra step makes unauthorised changes much harder.

Yes, .si is an established extension: according to the IANA record it has been in the root zone since 1 April 1992, and the public institute ARNES runs its registry. The registry's activity is regulated under Slovenia's Information Security Act, and since 15 March 2025 the zone has been updated every hour, so new registrations and changes go live with the next hourly update. During the demand spike of September 2026 the registry also reported that all services kept running smoothly despite a sharp rise in requests to its systems. In short, the superintelligence interest is new, while the infrastructure is more than 30 years old. Search for your name on the domain name search page.