Register up to 5 .si for €8.39 each.€8.39 is the first-year price for a new .si registration, until 30 November 2026: up to 5 .si for new resellers (after verification) and 1 .si for existing resellers. Further .si are charged the standard .si price. Every renewal €10.29.
The US government has made “SI” its official term for AI. Now’s your chance to register the most wanted .si names at a limited-time price. Offer ends 30 November 2026.
1,211%
rise in new .si registrations, September 2026
46,066
new .si domains registered in September
11,000
new .si domains on 30 September alone
2.4×
more new .si than .ai domains, 23 to 29 September
Available right now, tap to add to your list
API-first registration
Register and manage hundreds of .si names in one go
Registering one domain is easy anywhere. Managing hundreds is harder. With the Openprovider API, you can register and manage .si and 2,000+ other TLDs in one place.
Register hundreds of .si at once
Paste your list and register hundreds of .si in one order: the offer price covers your first 5 .si (1 if you already have an account), the rest are at the standard .si price. The same contact and nameserver settings apply to the entire list.
Update DNS across every .si in one step
Change nameservers or apply a DNS template to all your .si at once. You don’t need to edit each domain one by one.
Test every API call free before you go live
Automate checks, registrations, renewals and DNS from your own systems. Test every call in our free sandbox before you go live.
What the numbers say
A 34-year-old ccTLD just became one of the fastest-growing extensions online
Increase in new .si registrations in September 2026.
New .si domains registered in September 2026.
New .si domains registered in one day, on 30 September, the day after the US executive order.
More new .si than .ai domains registered from 23 to 29 September.
The time it took daily .si registrations to pass .ai after the US announced the change at the UN General Assembly.
How .si got here
How .si started to overtake .ai
.si is Slovenia’s country domain and has existed since 1992. In September 2026, the US government gave AI a new official name: “SI.” Overnight, .si became the matching domain.
Same industry, new shorthand. On 29 Sep 2026, US federal agencies switched from “AI” to “SI.”
The US President shares a poll on renaming AI “Super intelligence.” .si registrations start to rise.
At the UN General Assembly, the US says it will call AI “Super intelligence.” Within 25 hours, daily .si registrations pass .ai.
An executive order tells US federal agencies to use “SI” instead of “AI.”
About 11,000 new .si domains are registered in one day.
.si vs .ai
The best .si names are still available, for now
.ai is the country domain of Anguilla, a Caribbean island of about 15,000 people. When “AI” became the name of an industry, .ai became its address. It grew from 354,000 domains in 2023 to more than 1 million by January 20265Sherwood News, more than 1 million .ai websites (opens in a new tab), January 2026.. In 2023, Google started treating .ai as a global domain instead of a local one.6Search Engine Land, Google now treats .ai domains as generic top-level domains (opens in a new tab), 2023.
.si now matches a term the US government uses officially. It’s still early, so there are lots of opportunities. .si’s low price and no 2-year minimum, unlike .ai, make it very attractive for domain resellers.
| Side by side | .si | .ai |
|---|---|---|
| What it stands for | Super intelligence. The US government has used “SI” for AI since September 2026. | Artificial intelligence |
| Growth | New registrations up 1,211% in September 2026 | More than 1 million registered (January 2026)5Sherwood News, more than 1 million .ai websites (opens in a new tab), January 2026. |
| Minimum registration | 1 year | 2 years |
| Cost to start | €8.39€8.39 is the first-year price for a new .si registration, until 30 November 2026: up to 5 .si for new resellers (after verification) and 1 .si for existing resellers. Further .si are charged the standard .si price. for the first year, then €10.29 a year | €203.12 for the 2-year minimum |
| Domain name availability | Wide choice of names available | Most short and dictionary names are taken. Some resell for six and seven figures.5Sherwood News, more than 1 million .ai websites (opens in a new tab), January 2026. |
| Who can register | Anyone, anywhere | Anyone, anywhere |
Register your domains at cost price
With an Openprovider Membership, you get cost-price access to every TLD Openprovider is accredited for (including .si). Membership plans start at €4.99/year.
Before you register
What to know before you register .si
Some people doubt .si will last. Here’s where they have a point to be cautious.
Investors are registering first
So far, few companies use .si as their main website address. Most early demand comes from people buying names to resell or use later.
“SI” is a US term for now
The executive order changes what US government agencies call AI. Companies and other countries may or may not start using “SI” too.
Google treats .si as a Slovenian domain
Google made .ai a global domain only after people had used it worldwide for years. .si is not there yet.
Register .si with Openprovider
Register up to 5 .si for €8.39, renew every .si at €10.29
Until 30 November 2026, new resellers can register up to 5 new .si for €8.39 each after verification, and existing resellers 1 new .si. That is the first-year price. Every .si renews at €10.29 (€10.00 for Members), and that price stays after the offer ends. Here’s what you get:
- Instant registrationRegister from the dashboard or with one API call. Your domains go live as soon as you confirm.
- Bulk toolsRegister hundreds of .si in one order, the first 5 at the offer price and the rest at the standard .si price. Then update nameservers and DNS for all of them at once.
- Renewals down from €18.00 to €10.29A permanent price, not a one-off code: non‑Members renew every .si at €10.29, down from €18.00, and Members at €10.00, down from €10.53. Both stay after the offer ends.
- Support around the clockOur support team is available via 24/7 email, including weekends.
Until 30 November 2026
Prices exclude taxes.
Who gets .si for €8.39?
New resellers can register up to 5 new .si at €8.39 each after verification. Existing resellers can register 1 new .si at this price. It is a first-year price, until 30 November 2026.
Does the €10.29 renewal price end on 30 November?
No. €10.29 is the new renewal price for non‑Members, down from €18.00, and Members renew at €10.00, down from €10.53. Both prices stay after the offer ends.
Can I use several accounts to get more?
No. The offer is one per person or organization. Accounts that share payment details, billing details or other account data count as one customer, and the offer price needs a card or PayPal payment in your own name.
Does the offer cover transfers or renewals?
No. €8.39 is only for the first year of a new registration. Renewals, including later years of a multi-year registration, are €10.29 a year (€10.00 for Members).
Do I need a Membership?
No. You can register with a free account. Basic S Membership gives you cost-price access to every TLD Openprovider is accredited for, from €4.99/year.
Can I register a .si if I am not in Slovenia?
Yes. Anyone, anywhere can register a .si domain. You do not need a Slovenian address, company or local contact.
Why do people call .si "the new .ai"?
Because it follows the same pattern. .ai is Anguilla's country code and became the address of the AI industry because the letters matched. Since September 2026 the US government officially calls AI "Super intelligence", or SI, and .si is the matching extension.
Will a .si website rank in Google outside Slovenia?
Today Google treats .si as a Slovenian country domain, which can favour Slovenian search results. A .si site can still rank elsewhere, and Google has reclassified domains before, as it did with .ai in 20236Search Engine Land, Google now treats .ai domains as generic top-level domains (opens in a new tab), 2023., but there is no guarantee it will happen for .si.
Can I register and manage .si in bulk?
Yes. Paste a list to register hundreds of .si names in one order (the offer price covers your first 5 new .si, or 1 if you already have an account; the rest are at the standard .si price), then change nameservers or apply DNS templates across all of them at once. Everything is also available through the API.
Can I register a name that matches someone else's brand?
You should not. .si names are subject to an independent dispute resolution process, and a trademark owner can have a domain transferred if it was registered in bad faith. Register names you have a genuine reason to use.
Do you verify accounts?
Yes. We verify new accounts before they can use the offer price. This keeps the offer fair and keeps abuse out of a fast-growing domain.
Register up to 5 .si for €8.39 each, until 30 November
Every .si renews at €10.29 (€10.00 for Members), also after the offer ends.