a.ai to z.ai: What Every Single-Letter AI Domain Actually Does
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There are only 26 single-letter .ai domains. I went through all of them, one by one, to see who actually builds something and who just squats. The answer: about six run real products, one belongs to Elon Musk, one belongs to Google, one apparently belongs to Apple without a website, and the rest are for-sale pages asking between 1.5 and 500 million dollars. Here is the full alphabet.
Author: Koutian Wu; GitHub: ktwu01
The full rundown
a.ai: A black “Coming Soon” page with a UAE WhatsApp number. I looked the number up: a verified car dealer, Mohamed Redha Abdulla, linked to an Instagram car-selling account with about 240k followers. A held asset, not a product.
b.ai: BAI, with Justin Sun (TRON founder) as strategic advisor. Three layers: an OpenAI-compatible aggregator for Claude/GPT/Gemini/DeepSeek, crypto settlement (TRX/USDT, no KYC), and a story about “agent economic identity” built on ERC-8004 and x402. Layer 1 is real and boring, layer 2 is the actual business, layer 3 is marketing wrapped around layer 2.
c.ai: Character.AI, the biggest real product on the list. Consumer platform for chatting with AI characters, founded by ex-Google LaMDA engineers. Google hired the founders in 2024 with a non-exclusive license to the tech; since late 2025 it bans under-18 users from chats. Note it lives on c.ai but its brand site is character.ai.
d.ai: Dead. No DNS, no website, no public record of who holds it. Registered and dark.
e.ai: “E = Social + Chat + Money”, a super-app by EkChat Inc. combining a social network, messaging, and an E Pay wallet with Mastercard/Visa debit cards, wallet launching October 2026. The “powered by AI” branding is doing heavy lifting; it is a social-fintech app, not an AI lab.
f.ai: For sale. Buy-now price $2,500,000, offers from ~$1.5M. The pitch page notes “F evokes Facebook” and that “fai” means “do” in Italian. No product.
g.ai: Google. Acquired around early 2026 (registered through MarkMonitor, Google’s corporate registrar) and redirects to Google’s Gemini-powered AI Mode in Search. Google bought a single letter the way it buys everything: quietly, and because it can.
h.ai: For sale via DN.com, a Hong Kong broker. The listing claims comparables like “G.ai went for $5-8M”, which comes from the seller and should be treated as marketing.
i.ai: A nearly empty page titled “I.AI”. Registered in 2017 behind privacy shielding. Not the UK government’s i.AI incubator, which lives at ai.gov.uk. An opaque holding.
j.ai: For sale on the Name.am marketplace, buy-now $5,000,000.
k.ai: For sale via GetYourDomain.com, the brokerage of Larry Fischer, who brokered the reported $70M AI.com sale in February 2026. “Serious inquiries only.”
l.ai: Registered since 2018 to an individual in Fuzhou, China. Cloudflare nameservers, no website. Dormant investment.
m.ai: For sale, negotiations “require at least $1.5M”. The pitch notes that “m” sounds like buy/sell in Mandarin, aimed at e-commerce buyers. Registrant is a domain investor.
n.ai: A sales landing page calling itself “Neural Core of the AI Era”, also brokered by DN.com, benchmarked against x.ai and AI.com. Not a product, an asking price.
o.ai: Serves a page that is empty without JavaScript. Owner unknown, no verifiable product. A placeholder or a JS-only app nobody has identified.
p.ai: Programmai, a UK B2B predictive-marketing platform that rebranded onto p.ai. It ingests first-party customer data, predicts lifetime value and churn with ML, and pushes audiences into ad platforms. Clients include ASOS and Domino’s. A real, unglamorous, working business.
q.ai: Formerly Q.ai, Forbes’s AI investing app, shut down in late 2023. The domain now sits on Apple’s nameservers; domain-industry reporting in January 2026 said Apple bought it, presumably for something unnamed and future. Apple owns a letter and shows nothing for it, which is very Apple.
r.ai: R/AI, an e-commerce insights product: connect your Shopify or Salesforce Commerce data, get AI-generated insights back. Live as of early 2026, though the site was flaky when I checked.
s.ai: The personal website of a US technologist and lawyer known for conlang creation, FOIA lawsuits, and a liquid-democracy project, plus his Mastodon instance. Registered well before the .ai boom. The most human domain on the list.
t.ai: A for-sale lander with an offer form and Google Analytics. No owner named.
u.ai: For sale at $500,000,000 buy-now, or a $10M/month lease over 60 months. This is either the boldest or the least serious price on the internet.
v.ai: No website. Registered in 2017, Canadian privacy shield, offers through Sedo. Another vault.
w.ai: A real product with a crypto twist: a “Global AI Supercomputer” by the team behind WOMBO. Users donate idle GPU cycles to run AI inference in exchange for W COIN points; it also sells GPU rentals and an OpenAI-compatible inference API. DePIN, not a lab.
x.ai: Elon Musk’s xAI, maker of Grok. The only single-letter domain that is also a top-five AI lab. It blocks bots, which is on brand.
y.ai: For sale. Per the broker, held by a Chinese investor who owned nine single-letter .ai domains and sold several via DN.com. Registrant listed in Changsha, Hunan.
z.ai: Zhipu’s international brand, covered in my earlier notes: the only domain on this list besides c.ai and x.ai run by a company that trains frontier-adjacent models. GLM-5.x, MIT-licensed open weights, chat plus agent mode, a coding plan, and their own IDE.
The scorecard
Out of 26:
- Real AI products or companies: c.ai, g.ai, p.ai, q.ai (dormant, Apple), w.ai, x.ai, z.ai. Seven, and one of those is a redirect and one is a dead app.
- Crypto-adjacent: b.ai, w.ai.
- Actively for sale: f, h, j, k, m, n, t, u, y. Nine domains asking roughly $1.5M to $500M.
- Dark or opaque holdings: a, d, i, l, o, v. Six.
- A personal website: s.ai.
So about a quarter of the alphabet builds something. Half the rest is inventory waiting for a buyer, and the asking prices have clearly decoupled from what sits on the pages.
What the comparison shows
The domain market predicted a hierarchy years ago: short .ai names got bid up on the assumption that AI companies would pay anything for a clean name. What actually happened is that the labs that matter (Anthropic, DeepSeek, Zhipu) have names of normal length. Google and Apple bought single letters as defensive parking, not as products. The people making money on single-letter .ai domains today are brokers, not builders.
A good domain turned out to be a cost center, not a moat. The moat is the model.