Dimension scores are derived from public data and fields; weighted into the composite. Reference only.
CallSignLookup is an independent FCC License Lookup directory built from public bulk data in the U.S. Federal Communications Commission’s Universal Licensing System (ULS). It indexes around 5,137,487 FCC licenses, of which roughly 2,733,406 are active, covering multiple radio service categories including amateur radio, GMRS, maritime, aviation, land mobile, microwave, cellular, paging, and more.
The site’s primary use case is searching U.S. FCC licenses by call sign, name, or city, and displaying the service type, location, status, expiration date, and licensee/organization information. In addition to search, it supports browsing by service category, U.S. state/territory, and amateur radio license class, and provides an entry point for amateur radio licenses that are “expiring soon.” Its data source is explained fairly clearly: it comes from FCC ULS bulk data files, with files such as HD, EN, AM, and SH linked together to form complete license records.
From a developer-tool perspective, it is more of a public searchable data directory than a full development platform. The main content does not mention an API, SDK, webhooks, bulk export, query parameter documentation, or whether it is open source or self-hostable. Therefore, developers who need to integrate FCC license data into their own systems may still need to use the FCC ULS data download page directly, or process the FCC bulk data themselves.
No pricing, subscription, or paid features are mentioned in the main content, so it can currently be understood as a public lookup service. In terms of documentation, the site provides an FAQ, About page, data source information, usage guidance, and disclaimers, helping general users understand FCC call signs, GMRS, the scope of ULS data, and how it relates to the official FCC search. However, the documentation is more user-oriented and does not constitute developer API documentation.
Its strengths include broad coverage of radio service categories, transparent data sourcing, and rich browsing dimensions. It is suitable for radio enthusiasts, GMRS users, license holders, and communications industry researchers who need to quickly verify U.S. license information. Its drawbacks are that it is not an official FCC system, license status may lag official records by up to a week, and it lacks advanced search, API-based access, and self-hosting information.
Access from mainland China is not stated in the source content and would need to be tested in practice. Since its data mainly serves U.S. FCC use cases, Chinese users who only need to look up U.S. call signs can try accessing it directly. If the connection is unstable, the official FCC ULS License Search or direct downloads of FCC ULS bulk data files can be used as alternative data sources.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on callsignlookup.com official site.
callsignlookup.com is an United States API & Data provider. TG4G tracks its product information, an overall rating of 6.0/10, and a China-accessibility score of Workable. Click "Visit Official Site" to reach callsignlookup.com directly.