Best Domain Search 2027
Updated
The best domain search in 2027 checks the registry before it shows a name. On September 1, 2026 we RDAP-checked 2,449 .com names that 10 AI models had offered as available: 30.5% were free and 69.5% were already registered (AI Domain Hallucination Index). The weakest model, claude-haiku-4.5, had 259 of 282 picks taken (91.8%). The best row, claude-sonnet-5, was still only 50.5% available (287 names).
What the pages ranking for best domain search actually measure
On October 22, 2026 we read the pages that answer a best-domain-search query with a ranked list or a tool picker. iTechGuides, The Best Domain Search Tools in 2026, says it was updated in October 2026 and ranks 34 tools from official pricing pages and product docs. Instant Domain Search is #1 of 34 with an editor score of 9.4. DomainDiscovery is #2 at 9.2. DomainKits is #3 at 9.0. The advertiser disclosure on that page says vendors can pay for top positions in the rankings. The Instant Domain Search card also offers a placement labeled "Sponsor this spot · #1 · $149/mo". The card does not say Instant Domain Search paid for that spot.
The same list still ranks Lean Domain Search at #23 with a score of 7.0, and describes it as a straightforward, free way to turn keywords into available domain ideas. We fetched leandomainsearch.com on October 15, 2026. The homepage returned HTTP 200 and contained no form and no input field. That check is written up on the Lean Domain Search alternative page. A 7.0 next to a tool with no search box is an editor score from a directory, measured on a different day from the homepage we fetched.
Prospeo's Domain Search Tool Guide splits the phrase into jobs. For a name you can register, it points readers to Instant Domain Search and credits that tool with results in under 25 milliseconds and 800+ extensions. For an owner, it points readers to ICANN Lookup. The article text had no publication date when we read it on October 22, 2026. The speed and extension figures are Prospeo's. This page does not adopt them.
DomainToolBelt, read the same day, is a marketplace view: aftermarket listings, live auctions, and domains that had just dropped. The homepage states its own counts, including 200+ extensions and 10 million aftermarket listings, and it was showing auctions dated October 23, 2026 UTC. We did not audit those marketplaces or those counts. Shopping a name someone else is selling is a different job from checking whether the registry has a record.
A 9.4 is an editor's number on a page that also sells ranking positions. It is not a registry response, and it does not tell you whether the next name on your list is free.
What a domain search has to do before it shows a name
A domain search has to ask the registry, then show the name with the time of that check. RDAP is the protocol registries use to publish registration records. A language model can write a plausible string without making that request. In the September 1, 2026 study, 10 models suggested 2,449 .com names they treated as available. 30.5% were free. 69.5% were already registered. claude-haiku-4.5 had 259 of 282 taken (91.8%). claude-sonnet-5, the best row, was 50.5% available on 287 names.
An open registration record and a trademark are different facts. A .com with no registry record can still match a registered brand. Use the trademark check for that second question. It is a screen for risk, and it is not legal advice.
A check also goes stale. On Domain Search King, popular keywords can be served from checks up to about 30 hours old, and someone else can register a name minutes after any check. Before you pay, recheck the exact string on the verify page. The longer guide for a single name is how to check if a domain name is taken.
How Domain Search King checks a name
Type a keyword or a one-sentence description on the homepage. Keyword search builds three shapes. The keyword plus a suffix gives names that start with your word. A prefix plus the keyword gives names that end with it. A prefix, the keyword, and a suffix gives names that contain it. Names longer than 25 characters are dropped before checking. The AI mode takes the sentence, proposes coined names, and runs the same registry check before display. The reason for that order is the September study: even the strongest model in the run was wrong about half the time.
Every candidate is checked by RDAP before it is shown. The page sends names in batches through our RDAP proxy and falls back to Verisign's public RDAP server for .com and .net if the proxy does not answer. The proxy keeps available answers for about 10 minutes and taken answers for about 24 hours. The ".com only" switch is on by default. Turn it off and the page also checks .io, .co, .net, and .org, then adds names whose .com is taken and one of those four is open.
The search is free and needs no account. The current cap is about 100 naming calls a day per IP address, and one homepage search uses about five, so plan on roughly 20 searches. Offices and phone networks that share one address share that allowance. Agents can call the same checks through the MCP server, which has a separate free tier of 10 tool calls a day. In a separate June 2026 test of 76 names that server returned, 75 were available on recheck (98.7%). That sample is small. The 2,449-name study is the one that shows why a chat transcript is a weak availability source. The product behavior is summarized on the features page, and the model table is on the good AI domain names page.
Register buttons on the homepage open Namecheap through an affiliate link. We earn a commission if you buy there. The domain string is the same at any registrar, so you can copy the name and register it wherever you already have an account. The commission does not change which names the checker returns.
Which tool fits which domain job
Pick the tool by the question you need answered. The scores in the roundups above are their editor scores. The registry figures in this table are from our September 1, 2026 study and from the two homepage fetches named in the first section.
| Job | Use this | What we checked |
|---|---|---|
| Find a name and see if the .com is open | Domain Search King homepage | RDAP before display. September 1, 2026: 69.5% of 2,449 AI suggestions were taken |
| Check one exact name | Verify page | Live RDAP lookup for the string you paste |
| See which models suggest taken names | Hallucination Index | Same September 1, 2026 run, with a row per model |
| Starts-with, contains, or ends-with keywords | Homepage filters | Product behavior. Lean Domain Search had no search box on October 15, 2026 |
| Read a scored roundup of 34 tools | iTechGuides list, updated Oct 2026 | Read October 22, 2026. Editor scores. Paid top positions disclosed. Their TLD and bulk counts stayed theirs |
| Separate "can I register it" from "who owns it" | Prospeo guide: Instant Domain Search, then ICANN Lookup | Read October 22, 2026. Their under-25ms and 800+ extension lines stayed theirs |
| Buy a drop, an auction, or a listed aftermarket name | DomainToolBelt | Read October 22, 2026. Marketplace page. Counts and listings were not re-audited |
Use a registry check to decide whether you can register a name today. Use ICANN Lookup when you need the registration record. Use an aftermarket site when the name is for sale.
Limits of this domain search
- About 20 homepage searches a day per IP address, under the current 100-call cap.
- Popular keywords can reuse a check up to about 30 hours old. Available cache is about 10 minutes. Taken cache is about 24 hours.
- A result with no registration record is true for that moment. Recheck on the verify page before you pay.
- Trademark clearance is a separate step.
- Namecheap Register buttons are affiliate links. The commission is disclosed here and on the homepage.
- This article does not retest other companies' speed claims, extension counts, or auction inventories.
Type one keyword. The homepage checks the registry before it shows the names.
Search free, no accountFAQ
What is the best domain search in 2027?
The best domain search in 2027 checks the registry before it shows a name. Domain Search King does that with RDAP. On September 1, 2026, 69.5% of 2,449 AI-suggested .com names were already registered, and claude-haiku-4.5 had 259 of 282 picks taken (91.8%).
Why do AI name generators show taken domains?
A language model can write a plausible domain without asking the registry. In the September 1, 2026 study of 10 models, 30.5% of 2,449 suggestions were available and 69.5% were already registered. Domain Search King runs an RDAP check on each candidate before the name is shown.
Is Domain Search King free?
Yes, with no account. The search has a daily cap per IP address: about 100 naming calls a day, and one homepage search uses about five, so plan on roughly 20 searches. The MCP server for AI agents has a separate free tier of 10 tool calls a day.
Does available mean I can register the domain?
It means the registry had no registration record at the time of the check. Popular keywords can be served from checks up to about 30 hours old, and someone else can register the name minutes later. Recheck the exact name on the verify page before you pay. An open domain can still match a registered trademark.
Do best-of lists test whether a domain search still works?
The lists we read on October 22, 2026 publish editor scores and feature tables. iTechGuides ranked 34 tools, put Instant Domain Search first at 9.4, and says vendors can pay for top positions. That list still describes Lean Domain Search as a free way to turn keywords into available domain ideas, at rank 23 with a score of 7.0. Our October 15, 2026 fetch of leandomainsearch.com returned HTTP 200 with no form and no input field. Speed figures and extension counts on those lists are theirs.