A domain trademark check is the cheapest point at which to walk away from a name. Sources below were checked on 29 October 2026. This is a summary of the official sources, not legal advice: for a high-stakes name, ask a trademark lawyer.
Why the check is your job, not the registrar’s
Every generic domain is registered under ICANN’s Uniform Domain-Name Dispute-Resolution Policy (UDRP). Paragraph 2 says it plainly: “It is your responsibility to determine whether your domain name registration infringes or violates someone else’s rights.” By registering, you also warrant that “to your knowledge, the registration of the domain name will not infringe upon or otherwise violate the rights of any third party”.
Buying an existing name does not move the risk to the seller. WIPO’s Jurisprudential Overview 3.0 says “the transfer of a domain name registration from a third party to the respondent is not a renewal and the date on which the current registrant acquired the domain name is the date a panel will consider in assessing bad faith.” So a buyer is judged on what they knew and intended on the day they bought.
These disputes are common. WIPO says it handled “over 6,200 domain name cases” in 2025, “its highest caseload on record”, and has resolved “over 80,000 cases” in 25 years.
Where to run a domain name trademark check
The USPTO’s help page on a comprehensive clearance search lists the places to look: the US federal database, the Trademark Official Gazette (TMOG), “U.S. state trademark and business registries”, “Domain name registries”, Madrid Monitor, WIPO’s Global Brand Database, EUIPO’s TMview and the internet. Its minimum: “be sure to check our database and the TMOG for federal applications and registrations, and also search the internet for common-law use.”
| Tool | Run by | What it covers | Source |
|---|---|---|---|
| Trademark Search | USPTO | US federally registered and pending marks | uspto.gov/trademarks/search |
| TMview | EUIPO (TMDN) | “all EU national IP offices, the EUIPO, and several international partner offices outside the EU” | USPTO clearance page |
| Global Brand Database | WIPO | International (Madrid) marks plus national and international collections; search by name, number, goods and services or image | WIPO Global Brand Database page |
| Search for a trade mark | UK IPO (GOV.UK) | UK marks; search by number, owner, keyword, phrase or image | gov.uk/search-for-trademark |
| Madrid Monitor | WIPO | “international trademark registrations processed in the Madrid System” | USPTO clearance page |
| State registries and the internet | Various | US state marks; unregistered common-law use | USPTO clearance page |
WIPO adds that “it may be prudent to search also the registers of national/regional intellectual property offices.” Jersey and Guernsey keep registers separate from the UK’s.
Step-by-step: how to check domain trademark availability
1. Strip the name back to its words
Drop the extension before you search. Under the UDRP, the top-level domain “is viewed as a standard registration requirement and as such is disregarded under the first element confusing similarity test” (Overview 1.11.1). If a mark exists for the words in example.com, swapping to example.net or example.org does not avoid it.
2. Search identical marks, then similar ones
Start with exact matches in the USPTO system, TMview, the Global Brand Database and the UK IPO. Then widen the search. The USPTO says “Trademarks don’t have to be identical to be confusingly similar. Instead, they could just be similar in sound, appearance, or meaning, or could create a similar commercial impression.” Under the UDRP, a name containing the whole mark, or “a dominant feature” of it, will normally be treated as confusingly similar.
3. Check the goods, services and classes
A similar mark matters most when the goods or services are related. Offices group them into 45 Nice classes: “goods are in classes 1 to 34” and “services are in classes 35 to 45” (GOV.UK). The USPTO points out that identical marks can coexist, as with “Dove soap and Dove ice cream bars”. But do not treat a different class as a pass: related goods “don’t have to be in the same international class to be related.”
4. Look for common-law use
Registers miss unregistered brands. The USPTO says “Common-law rights are based solely on someone using their trademark in commerce within the United States with specific goods or services” and can affect a later registration. Search several engines for the name used as a brand, and check US state registries. The USPTO’s examining attorney will only check the federal database; the rest is “your responsibility”.
5. Check how the domain itself was used
For an existing or expired name, see what was on it. The Domain History Checker gives a year-by-year Wayback Machine timeline of what the domain was used for: past page titles, topic changes, gaps and redirects. A past life as a brand’s site tells you who may still care about the name. Dictionary words are no shield on their own: registering one “does not by itself automatically confer rights or legitimate interests” (Overview 2.10.1).
6. Record what you found
Save screenshots and search dates. Then accept the limit. The USPTO says “There’s no surefire way to uncover all potentially conflicting trademarks”, and suggests “hiring a private trademark attorney” for a full search.
What a clash can lead to: UDRP and the ACPA
Under UDRP paragraph 4(a), a complainant must show that “(i) your domain name is identical or confusingly similar to a trademark or service mark in which the complainant has rights; and (ii) you have no rights or legitimate interests in respect of the domain name; and (iii) your domain name has been registered and is being used in bad faith.” It adds: “the complainant must prove that each of these three elements are present.”
Bad faith includes a name “registered or … acquired” mainly to sell to the mark owner or a competitor above “documented out-of-pocket costs”. The UDRP remedy is “limited to requiring the cancellation of your domain name or the transfer of your domain name registration to the complainant.” It awards no money.
US law goes further. Under the Anticybersquatting Consumer Protection Act (15 U.S.C. 1125(d)), liability needs “a bad faith intent to profit from that mark”, and covers anyone who “registers, traffics in, or uses” such a name; “traffics in” includes sales and purchases. A plaintiff “may elect” statutory damages “of not less than $1,000 and not more than $100,000 per domain name, as the court considers just” (15 U.S.C. 1117(d)). What happens once a complaint is filed is covered in domain name dispute resolution.
Fitting the check into a purchase
Run the domain trademark search before you make an offer, not after. If the name is owned by someone else, the steps for approaching them are in how to buy a domain that is taken, and the payment side is in the safest way to buy a domain. If you are buying names to resell, this check belongs in your routine: see domain investing for beginners.
Frequently asked questions
Does a different extension avoid a trademark claim?
No. Under the UDRP the top-level domain is disregarded when judging confusing similarity.
If no registered mark shows up, is the name safe?
Not necessarily. Unregistered common-law use can still count, and the USPTO says there is “no surefire way” to find every conflict.
Is a mark in a different Nice class a problem?
It can be. The USPTO says related goods “don’t have to be in the same international class to be related”, so check what the other owner actually sells.
Can a UDRP case cost me money?
The UDRP itself only orders cancellation or transfer. A US court case under the ACPA can add statutory damages if bad faith intent to profit is shown.
The takeaway Search the registers, look past exact matches and classes, check common-law use and the name’s own history, and keep a record. When you are ready to buy, browse aged domains on the SERPHeroes marketplace, where sellers may list only “Names that are not someone else’s trademark”. That is a seller rule, not a guarantee, so run your own check too.
