How does PageSourceSearch know what learn-dutch-online.eu 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 learn-dutch-online.eu 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 learn-dutch-online.eu?

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 learn-dutch-online.eu?

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

learn-dutch-online.eu

Built with gtm, gtag, facebook-pixel, facebook-sdk, recaptcha, hotjar, @vitest/utils 5.0.2. 5 pages and 9 stored files, last crawled 2026-10-04.

rank 10,629,058 7 libraries 15 identifiers 6 third-party hosts 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
gtm		2026-10-04
gtag		2026-10-04
facebook-pixel		2026-10-04
facebook-sdk		2026-10-04
recaptcha		2026-10-04
hotjar		2026-10-04
@vitest/utils	5.0.2	2026-10-04

Tracking, tag and verification IDs

Public identifiers read out of the source. Each links to every other site in the index that carries the same one.

What	Value	Found in
Google Ads conversion id (Google)	AW-954044259	view source
Facebook app id (Meta)	225951590755638	view source
Meta pixel id (Meta)	586263495434911	view source
Meta pixel id (Meta)	664468612398627	view source
Meta pixel id (Meta)	824547024644897	view source
Google site verification (Google)	E9r-zYGsBflzUt5fGK39SZ5rbIqXY9_nzPcz9JyQ-hA	view source
Google site verification (Google)	S9GTzgtPKVNQFdVL6C0EDN0Uhh7zoq2_w8R2TPofwYY	view source
Google Tag Manager container (Google)	GTM-542MMSL	view source
Google Tag Manager container (Google)	GTM-PBPXQFMP	view source
Google Tag Manager container (Google)	GTM-TLCXTNV	view source
Hotjar site id (Hotjar)	1561591	view source
HubSpot portal id (HubSpot)	145012020	view source
LinkedIn Insight Tag partner id (LinkedIn)	1666932	view source
X (Twitter) pixel id (X)	o8wgp	view source
Universal Analytics property id (Google)	UA-134083342-1	view source

Third-party hosts

Hosts outside learn-dutch-online.eu 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
connect.facebook.net	script	view source
duyn491kcolsw.cloudfront.net	script stylesheet	view source
js-eu1.hs-scripts.com	script	view source
static.ads-twitter.com	script	view source
www.google.com	script	view source
www.googletagmanager.com	script iframe	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 9) }. 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
https://connect.facebook.net/en_US/sdk.js	js library	not fetched	2026-10-04	2026-10-04
https://www.google.com/recaptcha/api.js?hl=en&render=explicit	js library	not fetched	2026-10-04	2026-10-04
https://www.googletagmanager.com/gtag/js?id=AW-954044259	js library	not fetched	2026-10-04	2026-10-04
https://www.googletagmanager.com/gtag/js?id=UA-134083342-1	js library	not fetched	2026-10-04	2026-10-04
https://www.learn-dutch-online.eu/contact/	html	109.9 KB	2026-10-04	2026-10-04
https://www.learn-dutch-online.eu/l/blog-5-all-y…part-of-the-inburgeringsexamen/	html	85.7 KB	2026-10-04	2026-10-04
https://www.learn-dutch-online.eu/cart/	html	57.3 KB	2026-10-04	2026-10-04
https://www.learn-dutch-online.eu/blog/	html	84.6 KB	2026-10-04	2026-10-04
https://www.learn-dutch-online.eu/	html	112.4 KB	2026-10-04	2026-10-04

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.

2026-10-04 first crawl

5 pages, 9 files, 449.9 KB; 7 libraries, 15 identifiers, 6 third-party hosts
7 libraries added
- facebook-pixel
- gtag
- gtm
- hotjar
- @vitest/utils 5.0.2
- recaptcha
- facebook-sdk
15 identifiers added
- 664468612398627 Meta pixel id
- UA-134083342-1 Universal Analytics property id
- GTM-TLCXTNV Google Tag Manager container
- 1561591 Hotjar site id
- 824547024644897 Meta pixel id
- AW-954044259 Google Ads conversion id
- GTM-PBPXQFMP Google Tag Manager container
- GTM-542MMSL Google Tag Manager container
- S9GTzgtPKVNQFdVL6C0EDN0Uhh7zoq2_w8R2TPofwYY Google site verification
- E9r-zYGsBflzUt5fGK39SZ5rbIqXY9_nzPcz9JyQ-hA Google site verification
- 145012020 HubSpot portal id
- 1666932 LinkedIn Insight Tag partner id
- and 3 more
8 third-party hosts added
9 files added

Questions about learn-dutch-online.eu

How does PageSourceSearch know what learn-dutch-online.eu 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 learn-dutch-online.eu 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 learn-dutch-online.eu?: 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 learn-dutch-online.eu?: 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.