Google Analytics property ID lookup: find websites by GA ID

By SearchWebCode · Updated October 20, 2026 · Analytics · OSINT · 2 min read

To find a website by GA ID, search its public G- measurement ID or legacy UA- tracking ID. A GA4 property's numeric property ID is different and is not normally exposed in page source.

A Google Analytics property ID lookup can help you find websites by GA ID when a public tracking identifier appears in their homepage HTML. Search the exact identifier to find a website by GA ID, then inspect the source of each result. People sometimes reuse tags across a main site, landing pages and other domains; a shared reference is a research lead, rather than proof of common ownership.

Which Analytics web property ID can you search?

A GA4 measurement ID begins with G- and identifies a web data stream. Its numeric property ID is an administrative identifier, not the same value. Legacy Universal Analytics web property IDs use the UA-123456-7 format. For a public-source lookup, copy the G- or UA- identifier from the site's tag; entering a numeric GA4 property ID generally will not find the corresponding website. Google's measurement ID documentation explains the distinction.

GA4 vs Universal Analytics

Modern sites load GA4 with a G- measurement ID; the footprint gtag/js?id=G- is on 9,897,422 estimated matches (see the GA4 page). Legacy properties use a UA- ID, Universal Analytics's analytics.js is still on 3,615,203 estimated matches even though Google stopped collecting UA data in 2023, which makes a stale UA ID a great fingerprint for older networks.

Pivot on a specific ID

Start from one known site, open its source, and copy its exact ID. Then search the literal string, e.g. "G-ABCDE12345" (an illustrative ID). Results reference the same ID in captured source; that does not establish that they currently send data to it. To look for legacy IDs by shape rather than a known value, go regex: /UA-[0-9]{4,}-[0-9]+/. Browse analytics technologies for related footprints.

Read the source before you conclude

A shared ID is strong evidence, not proof, an ID can leak into a copied template, and agencies sometimes reuse one across unrelated clients. Open each result's full source and check the ID sits in the site's own tag, not a third-party embed. Then export the domain set and pivot again on anything else the pages share: an ad pixel, a support widget, a CDN account.

Count examples use retained query samples from 2026-10-14. Samples describe stored source from the current index; candidate bounds, estimates and exact matches have different meanings. Methods and author information.

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Frequently asked questions

Can I find a website by its numeric Google Analytics property ID?

Usually not through public page-source search. A GA4 numeric property ID is an administrative identifier. Search the public G- measurement ID or a legacy UA- tracking ID when it appears in captured HTML; these are different from the numeric GA4 property ID.

Can I find every site sharing one specific ID?

Yes, search the ID as a literal string (in quotes). Each result is a page that prints that exact measurement ID in its source.

GA4 or Universal Analytics?

GA4 IDs start with G- and load via gtag/js?id=G-. Universal Analytics IDs start with UA- and are still present on millions of un-migrated sites, which makes them useful for finding older networks.

Is a shared ID proof of common ownership?

It's strong evidence, not proof. IDs can be copied with a template or reused by an agency. Read each result's source to confirm the ID belongs to the site's own tag before drawing conclusions.