We Now Support .si Domains, and Why an “Available” 3-Letter .si Probably Isn't

.si, the country-code domain for Slovenia, is now fully supported on DNSLister. You can tick it in any search, find it in the ccTLD, Short and Popular TLD groups, and run it through the Letter Count tool to check every short combination at once.

.si has been getting a lot of attention lately: the number of registered .si domains roughly doubled between August and mid-October 2026, according to Register.si's own statistics. It's two letters, it reads well after a lot of English words, and registration isn't limited to people in Slovenia. So we did what we always do with a TLD that people are excited about: we checked all of it.

Quick answer

1. Open Letter Count, pick 3 letters, and tick .si.
2. Run it. That's all 17,576 combinations from aaa.si to zzz.si.
3. Before you get excited about any "available" name, run the RDAP check on that row. On .si, plenty of names that look empty are registered.
4. Register through a registrar that sells .si, and confirm the name there before paying.

What we found in the 3-letter .si space

A plain DNS lookup said a surprising number of 3-letter .si names were free. Names like vet, map, dad, vpn, ssl, rss and bmx. That should make anyone suspicious. Short, obvious words don't sit unregistered on a ccTLD this popular.

So we asked the registry directly, through its RDAP service, for each of those. Every one of them came back registered, just not in use:

• Inactive: registered, but the owner never pointed it at any nameservers.
• Server hold: registered, but switched off by the registry.
• Pending delete: registered, but on its way out. These can become available soon.

A domain with no nameservers is invisible to DNS. A DNS-only checker sees nothing and calls it available. The registry knows better.

Why this matters if someone is selling you a .si

If you see a 3-letter .si for sale, or a list of "unregistered" short .si names, check it yourself first:

• If the registry says it's registered and inactive, a seller can still transfer it to you. But "nobody owns this" isn't true, and the price should reflect a parked name, not a rare find.
• If it's pending delete, you may be able to register it yourself when it drops, for the normal fee.
• If the registry says it doesn't exist, it really is available, and you don't need a middleman.

How to check a .si name properly on DNSLister

• Run your search with any method. DNS is fine for a first pass over thousands of names.
• On the results page, use the RDAP button on the rows you care about. RDAP asks the .si registry itself and shows the registration status.
• Treat DNS "available" on .si as "maybe", and RDAP "not found" as "yes".

We're also working on doing that second check automatically for .si results, so the "available" list only shows names the registry confirms.

Disputes work differently on .si

Most generic TLDs (.com, .net and so on) use ICANN's UDRP for domain disputes. .si is a country-code domain, so disputes go through the .si registry's own rules instead. If you're registering a .si that matches a brand, read Register.si's policies first.

Ideas for short .si names

• Word endings. Words that already end in "si" or "-sy" sounds can read naturally as a domain hack.
• 4 letters. The 3-letter space is crowded. 4 letters has 456,976 combinations, so narrow it first. In Letter Count, add a Require filter like b* to check only names starting with B.
• Brandable pairs. Use the Builder to combine two short word lists and tick .si alongside .com.

Try it

Pick a length, tick .si, and run Letter Count. Then run the RDAP check on your favourites before anyone else does.