Single-Letter and Two-Letter .com Domains: The Rarest Real Estate on the Internet

There are only 26 single-letter .com domains in existence. There are 676 two-letter ones. Almost all of them are owned. Almost none of them ever change hands. The ones that do change hands trade for sums that make ordinary domain sales look modest.

This is the most concentrated form of digital scarcity that exists on the public internet. Below: what we know about the shortest .coms, who owns them, and why everything else feels long once you understand how this market works.

The 26 single-letter .coms

Single-letter .com domains were locked from new registration in 1993, before most of the internet had reached its first commercial users. The ones that already existed at the time were grandfathered in. ICANN has never released them.

The result is a fixed list of 26 names, almost all claimed by the early internet's most prominent players.

• X.com — Originally registered in 1993, held by Confinity/PayPal, sold to Elon Musk's first X venture, returned to PayPal, and re-acquired by Musk in 2017. Now serves as the front door to the platform formerly known as Twitter.
• Z.com — Held by Nissan, then Twitter, then sold to Japanese hosting giant GMO Internet in 2014 for $6.8 million — one of the few single-letter sales with a publicly confirmed figure.
• Q.com — Owned by CenturyLink (now Lumen). Used for the consumer internet/TV product Quantum.
• O.com — Owned by Overstock. A unique case because ICANN had to specifically auction it under the .com restriction; the high-six-figure final price was not disclosed publicly.
• G.com, M.com, T.com — Each owned by major brands (Google, Mars, T-Mobile).

The full set of 26 is owned. None has changed hands in recent years through a publicly disclosed sale. If you wanted one, the answer would not be "find an available one" — it would be "negotiate with whichever Fortune 500 currently owns it." And even then, most would not sell at any price you could reasonably quote.

Two-letter .coms — the next tier

There are 676 possible two-letter combinations (26 × 26). All of them are registered. The vast majority belong to corporations whose brand abbreviates to those two letters: AT.com (AT&T), HP.com (Hewlett-Packard), GE.com (General Electric), IG.com (the trading platform IG Group — sold for $4.7M in 2013).

The two-letter market spans a wider range of buyers than the single-letter market. Western corporations occupy the brand-matching ones. Chinese internet companies have aggressively acquired short numeric and Latin-character .coms over the past decade because mobile-first markets reward typing brevity. Crypto and AI ventures have been the recent wave.

Notable confirmed sales in adjacent categories:

• AI.com — Acquired by OpenAI in 2023; the figure was not disclosed but is widely speculated to be eight figures given the buyer and the timing.
• IG.com — $4.7 million (2013), sold to the London-listed trading platform IG Group.
• 360.com — $17 million (2015). Three characters, but worth mentioning alongside two-letter sales because Chinese acquisitions follow the same logic.
• QQ.com — Held by Tencent. One of the most-visited websites on the planet, never publicly for sale.

Why the shortest names command these prices

Three reasons, all compounding:

• Absolute scarcity. 26 single-letter .coms. 676 two-letter. The supply is mathematically fixed and almost entirely consumed by the early internet's first occupants. No new ones are ever created.
• Universal recall. A single letter or two-letter pair fits inside a customer's working memory perfectly. The brand association is instant. Type-in traffic for X.com is enormous — every user who has ever heard of "X" tries it at least once.
• Mobile-era typing economics. The shorter the URL, the lower the typing friction on a phone keyboard. In markets where most browsing is mobile, brevity is a meaningful conversion-rate factor.

What this means in practical terms

You will not own a single-letter .com. Neither will any business of any practical size — these names have moved past being a market and into being a kind of vault item, like a Picasso.

Two-letter .coms are also out of reach for most. The ones that have traded publicly start in the low millions.

The point of knowing this is to recalibrate your sense of the market. A "good" domain is not measured against X.com — it is measured against what is achievable for your business in your TLD and your category. For a Greek business, that often means a strong single-word or short two-word .gr — affordable, available with patience, and orders of magnitude more impactful than a longer awkward name.

If you have a one- or two-word .gr in mind that fits your business, check whether it is available. If it is already taken, the kapaweb backorder service queues you for the moment it might lapse. The .gr market is small enough that good names regularly become available — but only if you are watching.