21 websites carry this Google Tag Manager container in its source code@if (Model.Total > IdentifierModel.MaxSites) { ; the 200 highest-ranked are listed }. The GTM- container id.
Which websites use the Google Tag Manager container GTM-M4FXRTR?
The 21 sites listed on this page: each has the id in its stored HTML or first-party JavaScript. The GTM- container id; sites sharing one are usually run by the same owner, agency or platform.
How was GTM-M4FXRTR found?
By reading the stored source. PageSourceSearch keeps the exact bytes of the pages and scripts it crawls and extracts the identifier from the tag's own snippet or meta tag, so every listed site can be opened at the line that carries it.