How does PageSourceSearch know what fr-eng.de is built with?

From the site's own source code. The crawler stores the exact bytes of its pages and first-party scripts; the libraries are recognised by fingerprinting that code against known releases, the identifiers are read out of the tag snippets, and the third-party hosts are the script, iframe and stylesheet sources in the HTML and the absolute URLs inside the scripts. Nothing is inferred from headers or guessed.

How far back does the history of fr-eng.de go?

To the first crawl the timeline lists. Every crawl records what the site looked like; when a file's content changes, its earlier version stays viewable because the stored chunks are never deleted, only mapped. A crawl that finds a file unchanged adds no copy.

Can I see an older version of a script from fr-eng.de?

Yes. In the stored files list, every date under a file opens the version that was live at that crawl, with the same viewer as the current one. The raw bytes can be downloaded from there.

Which other websites use the same tracking IDs as fr-eng.de?

Each identifier links to its reverse lookup, the list of every site in the index whose source carries the same id: the sites one analytics property or tag manager container is shared across.

Site profile

fr-eng.de

Built with headjs 1.0.3, @vitest/utils 5.0.2, pace-progress 1.0.2, nivo-slider 3.2.0. 4 pages and 11 stored files, last crawled 2026-10-07.

rank 12,575,340 4 libraries 0 identifiers 1 third-party host 1 crawl open the site

Technologies and libraries

Recognised by fingerprinting the stored files and bundles against known releases; a version is the release the bytes match.

Library	Version	Seen
headjs	1.0.3	2026-10-07
@vitest/utils	5.0.2	2026-10-07
pace-progress	1.0.2	2026-10-07
nivo-slider	3.2.0	2026-10-07

Tracking, tag and verification IDs

No analytics property, tag manager container, pixel or site-verification token was found in the stored source.

Third-party hosts

Hosts outside fr-eng.de that its pages load scripts, frames or stylesheets from, and that its own scripts name in absolute URLs (connect). Each links to every site loading from the same host.

Host	Loaded as	Found in
domain.com	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 11) }. Versions are the crawls at which the file was new or its content changed; each opens the file as it was then, rebuilt from the same stored chunks.

File	Kind	Size	Collected	Versions
http://www.fr-eng.de/aBilder//dyncss.js	js	116.3 KB	2026-10-07	2026-10-07
http://www.fr-eng.de/lays/website-h/pace2.min.js	js	1 KB	2026-10-07	2026-10-07
http://www.fr-eng.de/lays/komponenten/preloader/pace.min.js	js library	12 KB	2026-10-07	2026-10-07
http://www.fr-eng.de/aBilder/head.js	js	36.8 KB	2026-10-07	2026-10-07
http://www.fr-eng.de/aBilder/tt_javascript.js	js	35.1 KB	2026-10-07	2026-10-07
http://www.fr-eng.de/aBilder/magnificPopupGallery/magnificpopup.js	js	20.3 KB	2026-10-07	2026-10-07
http://www.fr-eng.de/aBilder/jquery.js	js library	90.9 KB	2026-10-07	2026-10-07
http://www.fr-eng.de/referenzen/	html	38.2 KB	2026-10-07	2026-10-07
http://www.fr-eng.de/fr-engineering/	html	30.8 KB	2026-10-07	2026-10-07
http://www.fr-eng.de/leistungen/	html	28.8 KB	2026-10-07	2026-10-07
http://www.fr-eng.de/de/	html	26.6 KB	2026-10-07	2026-10-07

Timeline

One entry per crawl, newest first, with what changed since the crawl before: libraries, identifiers, third-party hosts and files. Historical versions stay viewable because the stored chunks are shared between versions, never copied.

2026-10-07 first crawl

4 pages, 11 files, 436.8 KB; 4 libraries, 0 identifiers, 1 third-party host
4 libraries added
- @vitest/utils 5.0.2
- nivo-slider 3.2.0
- headjs 1.0.3
- pace-progress 1.0.2
1 third-party host added
- domain.com
11 files added

Questions about fr-eng.de

How does PageSourceSearch know what fr-eng.de is built with?: From the site's own source code. The crawler stores the exact bytes of its pages and first-party scripts; the libraries are recognised by fingerprinting that code against known releases, the identifiers are read out of the tag snippets, and the third-party hosts are the script, iframe and stylesheet sources in the HTML and the absolute URLs inside the scripts. Nothing is inferred from headers or guessed.
How far back does the history of fr-eng.de go?: To the first crawl the timeline lists. Every crawl records what the site looked like; when a file's content changes, its earlier version stays viewable because the stored chunks are never deleted, only mapped. A crawl that finds a file unchanged adds no copy.
Can I see an older version of a script from fr-eng.de?: Yes. In the stored files list, every date under a file opens the version that was live at that crawl, with the same viewer as the current one. The raw bytes can be downloaded from there.
Which other websites use the same tracking IDs as fr-eng.de?: Each identifier links to its reverse lookup, the list of every site in the index whose source carries the same id: the sites one analytics property or tag manager container is shared across.

Look up another site, browse sites by tracking ID, third-party host or technology. Site owners: see the crawler page for how stored pages are removed.