Overview
iP51 (ip51.com) is a third-party trademark search page for Chinese-speaking cross-border sellers. It is not the USPTO, UK IPO, EUIPO or CNIPA. Sellers use it to scan a brand string by country and Nice class — United States, United Kingdom, European Union, Japan and others — before they buy inventory, a domain, or an agency package. The site root redirects to /brand/search. An older host, ip.zying.net, bounces to ip51.com. The footer shows Zhejiang ICP filing 浙ICP备16001766号-2, and the empty-state page advertises Zying ERP and other seller tools. Treat it as a marketplace-adjacent lookup layer, not a government register.
The job is a Chinese UI for a first pass across several offices, not a registration. Precise and fuzzy queries hit on-site APIs (/brand/precise-search, /brand/fuzzy-search). Copy on the form says at most about 200 results per query. Legal status, office actions and whether you may file still come from each country’s official register.
Core features and advantages
Multi-country search
The country picker includes the United States (USTM), United Kingdom (UKIPO), Canada, Mexico, the EU, France/Germany/Italy/Spain, Japan, Korea, the UAE, Singapore, Australia, New Zealand, the Madrid System, the Lisbon System and further Asian, Middle Eastern and Latin American offices. That is faster than opening four official sites if you sell into the US, UK, EU and Japan together. Status filters: all, valid, invalid, pending. This is an aggregated or mirrored lookup. The site does not publish refresh lag or field completeness, so it is not a live official docket.
Nice Classification table
A linked Nice Classification page lists Chinese and English goods terms and lets you tick classes 01–45 before searching. Page titles still say “international Nice Classification 2020 edition”. WIPO Nice Classification 13-2026 took effect for member offices on 2026-01-01, and CNIPA enabled the corresponding Chinese text. After you pick classes on iP51, re-check current terms in the USPTO ID Manual or the UK/EU/CNIPA tables before you file. Classification pages have shown mobile number 13810430302; that is not a government hotline.
Precise versus fuzzy search
Use precise search for a locked brand word; fuzzy search for spelling variants. Pick country and class first or the result set is noisy. iP51 does not file, collect official fees, answer office actions or enrol Brand Registry. A clean search is not permission to list.
Supported platforms
iP51 searches trademark data sources, not store backends. Typical use is brand clearance for Amazon, eBay or a DTC site. There is no Shopify app and no public API price sheet. China-register questions belong on CNIPA’s official query system, not only on a third-party page.
Who it's for
- Solo / small teams who have not hired counsel yet and want a Chinese UI to kill obvious collisions.
- Operators expanding the same brand into the US, UK, EU and Japan and need a first look at which offices already have a similar mark.
- Skip it if you need a filing, an admissible search report, or a serious device-mark search — go to the official office or an attorney.
- Do not use it as a registration portal, Brand Registry evidence, or a licence to sell.
Concrete use: before listing a new lighting brand on Amazon US and UK, select United States, United Kingdom and class 11, then run precise and fuzzy searches. If the US already shows a live registration, pause packaging. Confirm on USPTO and UK IPO search before you decide to file.
Pricing and value
On 2026-09-06 the search form was usable with no public rate card, plan list or API tariff. Whether hidden quotas or login-gated fees exist is not stated. Do not invent a price. Official fees are paid to each trademark office, not to iP51.
Community feedback
There is almost no long-form Reddit, Zhihu or Cifnews thread about iP51 itself. What is public is the site: a Chinese seller tool, a redirect from Zying ERP’s old host, and an ICP number. Ads for Superbrowser or LinkFox are not a quality endorsement. For community signal, trust the official office you actually rechecked.
Competitive positioning
iP51’s edge is a Chinese multi-country first pass. USPTO, UK IPO, EUIPO and JPO are the registers you can file on, pay and show to a platform. Classification-only sites, if they are even reachable, only help pick Nice classes. Agency platforms bundle search with filing — they are vendors, not offices. iP51 appears to charge nothing for the form, and it also gives you no attorney opinion.
Alternatives
- United States Patent and Trademark Office: authoritative US search and filing.
- European Union Intellectual Property Office: official EUTM search and filing.
- Japan Patent Office: Japanese register.
- UK Intellectual Property Office: official UK search and fee-paid filing.
Limitations
Not an official register; lag is undisclosed. The Nice page still labels a 2020 edition, which may diverge from NCL 13-2026. About 200 hits per query. Device-mark depth is not documented. No public support email. Heavy adjacent advertising. It does not replace a counsel search or Brand Registry.
Verdict
Use iP51 as a free Chinese first filter when one brand will hit several marketplaces. File, pay and enrol only on USPTO, UK IPO, EUIPO or JPO. Do not describe this page as an “international trademark office”.
Next step: open ip51.com/brand/search, run one precise search, then recheck the same mark on the official offices linked above.
Data notes
Rechecked 2026-09-06 on the ip51.com search page, Nice Classification page and ICP footer. The site was reachable. published (2024-03-15), monthlyVisits, domainRating and authorityScore are catalogue placeholders and unverified. Operating-company legal name, launch date and whether search is billed are unverified. Classification version follows WIPO and each office’s current text.