Available 4-letter domains
Short, four letters, easy to say, and on .com completely impossible to register. Every four-letter .com is taken. This page is about where four-letter names still exist, with a curated set checked live.
Reviewed August 2026
Each name runs four letters before the dot, across extensions where short names can still be found. Status is checked live when the page loads.
The math here is short. There are 26 letters, so there are 26 by 26 by 26 by 26, which is 456,976 possible four-letter strings. On .com, every single one is registered. Not most of them. All of them. They were swept up years ago, a lot of them by people who treat four-letter .com names as a kind of currency, traded and parked and resold rather than used. So a page promising 'available four-letter .com domains' is selling something that doesn't exist.
Where four letters still works
The four-letter idea isn't dead; it just isn't on .com. Move to .io, .co, .dev, .app or one of the newer extensions and four-letter space opens back up, because those namespaces are younger and smaller. You won't find a four-letter dictionary word sitting open on a popular extension either, since those went early too. But coined four-letter names are very findable. Short, made up, and yours.
Why four letters is a good length
Four letters is long enough to feel like a word and short enough to never need spelling out. You can say it once on a phone call and be understood. It fits in a logo without shrinking. It usually leaves room for a matching handle on the platforms you care about. The catch was always supply, not appeal, and that's exactly why coining beats searching: a name you invent has no prior owner to outbid.
When four letters is one letter too few
Four slots is tight. That's the appeal and it's also the catch. You get one syllable, two if the vowels fall kindly, and plenty of coined four-letter names come out looking like a serial number rather than a name. If nothing below sits right, the answer is usually one more letter rather than a different extension.
There's a matching list of available 5-letter domains, coined and checked the same way. Five is where most of the names people actually remember end up, because the extra letter buys you a second syllable to work with.
About the list
Every entry below is four letters before the dot, spread across extensions where four-letter names can still be had. Each is checked live on load, DNS first and then a registry check.
Every name on the list was unregistered at the last review, and short names move fast, so expect a few to have gone since. Treat the green ones as a short window, and if nothing fits, the generator will produce more at the same length.