4 Letter .ai Domains for Sale: How to Buy One

Four-letter .ai domains are the sweet spot of the short .ai market: still scarce, far cheaper than three letters, and wide enough to hold a real word. Reported sales run from about $10,000 for a solid brandable four-letter name up to $800,000 for Home.ai in 2025 and $750,000 for Omni.ai in 2026. There are 456,976 possible letter-only four-character combinations, roughly 26 times the three-letter pool, so a handful are still available to register outright and the rest trade on the aftermarket. Here is what four-letter .ai domains actually cost, which ones are still available, and how to buy one without getting burned.

Reported 4 letter .ai domain sales

Public comps are the only honest starting point for a negotiation. These are reported .ai sales at four characters, plus a three-letter reference point so you can see how steep the drop-off is by length.

Every top-priced name in that table is a common English word. Mini.ai and Ado.ai are both short and both real words, and they closed roughly $40,000 apart despite the extra character. That is the pattern worth internalizing: meaning drives price far harder than length does.

How much does a 4 letter .ai domain cost?

A four-letter .ai domain usually costs $10,000 to $60,000 for a clean, pronounceable brandable name, while genuine dictionary words at four letters run into six figures. Random four-letter strings with no pronunciation sit in the $500 to $3,000 range, and the leftover unregistered combinations cost only the standard registration fee of roughly $65 to $86 per year. Budget by name quality, not by character count.

Here is how the tiers break down in practice:

• Common English words (home, omni, mini, bolt, sage, atom). Six figures and often much more, because the word carries meaning into any product category.
• Pronounceable invented brandables (kova, zeda, luvo, nirr). Roughly $8,000 to $40,000. This is where most funded startups actually shop, and where the best value sits.
• Acronyms with an existing industry meaning (SaaS-style or technical initialisms). Wildly variable, from $3,000 to well past $50,000 depending on how many companies want the same four letters.
• Random consonant strings (xqzb, hjfv). Under $1,000, and some are still unregistered.

Are there 4 letter .ai domains still available?

Yes. With 456,976 letter-only combinations, the four-letter .ai pool is far from swept, unlike the three-letter set where only about 1,000 weak combinations remained as of a November 2025 availability list. What is gone is everything desirable. Every pronounceable four-letter arrangement and every dictionary word was registered years ago, so the names still open to hand registration are the ones nobody could build a brand on.

That said, availability shifts daily. Owners let renewals lapse, especially on .ai where the two-year minimum term makes holding costs noticeable, and names drop back into the pool. Running a fresh check costs nothing, and our guide to checking domain availability covers the lookup tools that also show expiry dates worth watching.

4 letter .ai vs 4 letter .com domains

A four-letter .com is the safer long-term store of value; a four-letter .ai is the better fit if your product is AI and you want that recognized in one glance. The .com market has thirty years of comps and total registration saturation. The .ai market is newer and moving faster, having crossed one million registrations in January 2026 and recorded the highest average sale price of any extension on Sedo's marketplace in 2025.

The holding cost line surprises people. The .ai registry requires a minimum two-year registration or renewal, and wholesale pricing rose by $10 per year on March 5, 2026, so a portfolio of a hundred .ai names is a meaningful annual bill rather than a rounding error. Full current numbers are in our .ai domain cost guide.

Where to buy 4 letter .ai domains

Start with curated marketplaces if you want a fixed price and a handled transfer, then widen to Sedo, Afternic and Dan for volume and auctions. Four-letter .ai inventory is thin on any single platform, so most serious buyers search several, then fall back on direct outreach when the exact name they want is parked or in use. Expired auctions are worth monitoring specifically on .ai, because that two-year renewal cycle pushes more names into lapse than a typical .com portfolio would.

Pay through escrow every time. The transfer of an .ai name is not instant, and a licensed escrow agent holds funds until the domain lands in your account. Our explainer on how domain escrow works covers the timeline and fee split, and every name in our premium domains marketplace transfers this way as standard.

Are 4 letter .ai domains a good investment?

They carry better risk-adjusted odds than three-letter .ai for most buyers, because you pay a fraction of the price for a name a customer can actually pronounce. The catch is the same one hitting the whole extension: the median .ai sale price peaked at $3,789 in 2022 and dropped to roughly $811 by 2025, close to an 80 percent decline, even while headline sales set records. Value concentrated at the short and brandable end while the generic middle sank.

For an operator, that split is good news. You are not buying an index, you are buying one name to build on, and a memorable four-letter .ai does that job for less than an equivalent .com. For a pure investor, be honest that you are making a concentrated bet on continued AI company formation in the United States, and price accordingly rather than paying the seller's anchor.

What to verify before you buy

Four checks separate a clean acquisition from an expensive mistake. Confirm there is no trademark collision, since short strings collide with registered marks more often than long ones and a mark holder can pursue a UDRP dispute. Pull the name's history through archived snapshots to be sure it was never used for spam, which can leave a lasting mark on email deliverability and search visibility. Confirm the two-year .ai renewal math fits your budget. And build your own valuation instead of trusting an automated appraisal, using our guide to what a domain name is worth.

One more step people skip: once you own a short, valuable brand name, someone will eventually register a lookalike. It is worth setting up something that will alert you when your brand shows up somewhere new online, so a copycat spelling does not quietly siphon your traffic for months before you notice.

Should you buy 4 letters or something longer?

If a strong four-letter .ai fits your budget, take it, because four characters is short enough to type, say on a call, and fit in an app icon without ever feeling cramped. Below about $10,000, though, a good five or six-letter brandable will beat the four-letter junk that price buys you. Nobody remembers XQZB, and plenty of successful companies run on longer names that sound like something.

Compare real inventory next: browse our .ai domains for sale, look at 5 letter domains for more choice at a lower price, or read the 3 letter .ai domain price guide if you are shopping at the very top of the market. Our overview of whether domain length affects SEO is worth reading before you pay a premium purely for brevity.