I've been watching the .si conversation pick up, and I went in more skeptical than I am now.
On paper, .si is the country code for Slovenia. That's what it is. That's how almost everyone outside our world reads it. But domainers have always been good at finding a second meaning in an extension, and once in a while that second meaning actually takes. The rest of the time it's just a story we tell each other while we're renewing names we should have let go.
The second meaning this time is "super intelligence." And the only reason anyone takes it seriously is .ai. We all watched that one go from a ccTLD nobody thought about to one of the hottest extensions in tech. AI became the word everyone was saying, and .ai was already sitting there, perfectly named for it.
So the question on the table is whether .si can borrow some of that.
The registry isn't dead, I'll give it that. As of June 5, 2026, Register.si shows 184,436 .si domains registered, with 6,342 of those new in the last month and 400 in the last 24 hours. That's real movement for a small ccTLD.
But small is the word that matters. .ai crossed a million registrations this past January. Domain Name Wire had it at 598,007 at the start of 2025, so call it 67% growth in a year. .com is on another planet, 163.6 million names at the end of Q1, out of 392.5 million across every extension there is, per the latest DNIB numbers. .si isn't in that conversation, and it isn't close to .ai either.
None of that kills the idea. It just means I want to look at it with my eyes open.
One thing I keep coming back to. With .ai, the buyer never needed anything explained. A startup throws an AI tool up on a .ai and everyone gets it instantly. The extension does the work. Does .si do that work for anyone outside our little circle? A domainer sees "super intelligence" right away. A founder deep in the space might. The person actually writing the check, probably not, at least not yet.
A strong .si could still land. Something short, something clean, tied straight to intelligence or agents or models or compute. There the extension is helping, handing the buyer a story before they've asked for one. But a weak name in .si is still just a weak name, and that's where these things go sideways. The angle shows up, the good names get grabbed, and then the quality falls off a cliff. Suddenly everything is a "super intelligence domain." Two random words. A phrase that wouldn't survive in .com, never mind a small country code.
And this isn't even a fresh angle. The .si super intelligence thing has been kicking around NamePros since the summer of 2024, when one X post sent a bunch of us scrambling to hand-register before lunch. So when I say we've seen this movie, I mean I've sat through this exact one already. I've registered into a trend, felt smart for a week, and then watched the renewal invoice tell me the truth a year later.
So I'm not calling .si a bad bet. I actually think it's one of the more interesting speculative angles going right now. Short, clean, real registry, real usage, and it's tied to a term that could get louder if the conversation keeps drifting from AI to AGI to super intelligence. But interesting isn't a market. A trend is domainers being interested in something. A market is end users showing up to buy and to keep paying for it. .ai has that. You can point at the companies. .si doesn't, not yet.
Maybe it gets there in a smaller way. A couple of strong names sell, somebody points at them, a real AI company launches on one and lends the whole thing some credibility. That's usually how these starts actually happen, slowly, with a handful of examples doing the convincing.
The test I'd use isn't complicated. Would the name look right on the homepage of a serious AI company? If yes, maybe .si is worth a look. If the honest answer is "it sort of works once you explain that SI means super intelligence," I'd slow down. The story is interesting and the timing isn't crazy, but the name still has to carry it.
Which is where I keep getting stuck, if I'm being straight about it. Some days the short ones look obvious and I'm halfway to checkout. Other days I remember every other extension that was going to be the next .ai and wasn't, and I close the tab. I haven't decided. I'm not convinced the people loudest about it have either.