How does PageSourceSearch know what semapps.org 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 semapps.org 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 semapps.org?

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 semapps.org?

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

semapps.org

Built with @popperjs/core 2.11.8, prismjs 1.30.0, bromcom-ui 2.12.3, flowbite 4.0.2, @inkeep/cxkit-js 0.5.119, paymob-pixel 1.2.7, formiojs 4.21.7, @tolgee/web 7.2.1, @hyperdx/browser 0.26.0, graphql-playground-react 1.7.28, @vitest/utils 5.0.2, scanbot-web-sdk 9.0.0 and more. 5 pages and 139 stored files, last crawled 2026-10-03.

rank 1,830,785 24 libraries 0 identifiers 132 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
@popperjs/core	2.11.8	2026-10-03
prismjs	1.30.0	2026-10-03
bromcom-ui	2.12.3	2026-10-03
flowbite	4.0.2	2026-10-03
@inkeep/cxkit-js	0.5.119	2026-10-03
paymob-pixel	1.2.7	2026-10-03
formiojs	4.21.7	2026-10-03
@tolgee/web	7.2.1	2026-10-03
@hyperdx/browser	0.26.0	2026-10-03
graphql-playground-react	1.7.28	2026-10-03
@vitest/utils	5.0.2	2026-10-03
scanbot-web-sdk	9.0.0	2026-10-03
kifu-for-js	5.5.0	2026-10-03
tripetto-runner-foundation	6.3.1	2026-10-03
@collectionspace/cspace-public-browser	4.0.0	2026-10-03
@accusoft/pdf-viewer	3.11.158639	2026-10-03
@ant-design/x	2.9.0	2026-10-03
arv-extends	5.0.3-status-track-1.71	2026-10-03
@okta/okta-signin-widget	7.49.1	2026-10-03
@wix/image	1.454.0	2026-10-03
@lottiefiles/lottie-player	2.0.12	2026-09-25
@cognigy/webchat	3.50.0	2026-09-25
replaywebpage	2.5.3	2026-09-25
react-grid-layout	2.2.4	2026-09-25

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 semapps.org 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
100lieuxnourriciers.fr	connect	view source
acteurs-solidarite.aurba.org	connect	view source
activitypods.org	connect	view source
activitypub.rocks	connect	view source
addons.mozilla.org	connect	view source
alertes.colibris-lafabrique.org	connect	view source
alice.loophole.site	connect	view source
app.lescheminsdelatransition.org	connect	view source
app.passerellenormandie.fr	connect	view source
archipel.assemblee-virtuelle.org	connect	view source
bienvenuechezmoi.org	connect	view source
blog.orgtech.fr	connect	view source
cdn.jsdelivr.net	connect	view source
cercles.assemblee-virtuelle.org	connect	view source
chat.lescommuns.org	connect	view source
classe-dehors.org	connect	view source
classic.yarnpkg.com	connect	view source
codeberg.org	connect	view source
community.startinblox.com	connect	view source
communitysolidserver.github.io	connect	view source
create-react-app.dev	connect	view source
data.virtual-assembly.org	connect	view source
data.yourserver.com	connect	view source
developer.mozilla.org	connect	view source
discourse.org	connect	view source
docs.docker.com	connect	view source
docs.google.com	connect	view source
docs.joinmastodon.org	connect	view source
docs.mapbox.com	connect	view source
docusaurus.io	connect	view source
elcapitan.fr	connect	view source
en.wikipedia.org	connect	view source
example.com	connect	view source
flod.io	connect	view source
forums.assemblee-virtuelle.org	connect	view source
fr.slideshare.net	connect	view source
fr.wikipedia.org	connect	view source
fullcalendar.io	connect	view source
gergap.wordpress.com	connect	view source
github.com	connect	view source
github.github.com	connect	view source
gogocarto.fr	connect	view source
grezi.fr	connect	view source
handlebarsjs.com	connect	view source
hub.docker.com	connect	view source
hubl.world	connect	view source
humhub.com	connect	view source
inrupt.com	connect	view source
insomnia.rest	connect	view source
issues.apache.org	connect	view source
jena.apache.org	connect	view source
joinmastodon.org	connect	view source
jotform.com	connect	view source
json-ld.org	connect	view source
jsonview.com	connect	view source
jwt.io	connect	view source
ldapwiki.com	connect	view source
leafletjs.com	connect	view source
lescheminsdelatransition.org	connect	view source
loophole.cloud	connect	view source
marmelab.com	connect	view source
mastodon.social	connect	view source
mattermost.com	connect	view source
meta.flod.io	connect	view source
moleculer.services	connect	view source
mui.com	connect	view source
my-cas-server.com	connect	view source
mydomain.com	connect	view source
myissuer.com	connect	view source
mysoft.com	connect	view source
ngrok.com	connect	view source
nodeinfo.diaspora.software	connect	view source
nodejs.org	connect	view source
opencollective.com	connect	view source
otherserver.com	connect	view source
pad.lescommuns.org	connect	view source
payscreillois.colibris-groupeslocaux.org	connect	view source
prefix.cc	connect	view source
prestashop.com	connect	view source
prettier.io	connect	view source
purl.org	connect	view source
rdfs.org	connect	view source
reactjs.org	connect	view source
s3.standard.indie.host	connect	view source
scenaristeur.github.io	connect	view source
schema.org	connect	view source
semapps.example	connect	view source
semapps.meta.assemblee-virtuelle.org	connect	view source
server.com	connect	view source
sharp.pixelplumbing.com	connect	view source
slashdot.org	connect	view source
solid.github.io	connect	view source
solidproject.org	connect	view source
stackoverflow.com	connect	view source
startinblox.com	connect	view source
tiptap.dev	connect	view source
tools.ietf.org	connect	view source
twitter.com	connect	view source
unpkg.com	connect	view source
v4.mui.com	connect	view source
virtual-assembly.hubl.world	connect	view source
virtual-assembly.org	connect	view source
w3c-ccg.github.io	connect	view source
w3id.org	connect	view source
webplatform.github.io	connect	view source
wiki.archlinux.org	connect	view source
wordpress.com	connect	view source
www.dataversity.net	connect	view source
www.drupal.org	connect	view source
www.dublincore.org	connect	view source
www.eventbrite.com	connect	view source
www.example.com	connect	view source
www.facebook.com	connect	view source
www.flod.io	connect	view source
www.freecodecamp.org	connect	view source
www.gnu.org	connect	view source
www.google.com	connect	view source
www.linkedin.com	connect	view source
www.mozilla.org	connect	view source
www.ontotext.com	connect	view source
www.packetizer.com	connect	view source
www.postman.com	connect	view source
www.reddit.com	connect	view source
www.researchgate.net	connect	view source
www.robinwieruch.de	connect	view source
www.virtual-assembly.org	connect	view source
www.w3.org	connect	view source
www.youtube.com	connect	view source
xmlns.com	connect	view source
yeswiki.net	connect	view source
yourfrontend.com	connect	view source
youtu.be	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 139) }. 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://semapps.org/assets/js/7735.2aed9b90.js	js	4.7 KB	2026-10-03	current
https://semapps.org/assets/js/7036.db1c4503.js	js	26.6 KB	2026-10-03	current
https://semapps.org/assets/js/6048.9d72e388.js	js	8.3 KB	2026-10-03	current
https://semapps.org/assets/js/5449.eaf969c2.js	js	59.5 KB	2026-10-03	current
https://semapps.org/assets/js/1906.84d451a6.js	js	582.9 KB	2026-10-03	current
https://semapps.org/assets/js/4972.21230a43.js	js	1.1 KB	2026-10-03	current
https://semapps.org/assets/js/139169e6.6c0b9fd8.js	js	4.3 KB	2026-10-03	current
https://semapps.org/assets/js/ebfb1aac.1c0f8237.js	js	4.7 KB	2026-10-03	current
https://semapps.org/assets/js/47a34db7.1e4b9124.js	js	1.5 KB	2026-10-03	current
https://semapps.org/assets/js/1be78505.f36f14ad.js	js	11.7 KB	2026-10-03	current
https://semapps.org/assets/js/40183e4d.c031dc52.js	js	12.7 KB	2026-10-03	current
https://semapps.org/assets/js/97923934.2d52ee4a.js	js	8.9 KB	2026-10-03	current
https://semapps.org/assets/js/e43190a0.8d2380ca.js	js	4.2 KB	2026-10-03	current
https://semapps.org/assets/js/172caeac.ed9c635f.js	js	6.8 KB	2026-10-03	current
https://semapps.org/assets/js/e1e17869.9a2507b1.js	js	6.4 KB	2026-10-03	current
https://semapps.org/assets/js/5c342033.37e9e873.js	js	6.2 KB	2026-10-03	current
https://semapps.org/assets/js/9b75c6ca.72a73749.js	js	20.2 KB	2026-10-03	current
https://semapps.org/assets/js/09c30c29.f597b0be.js	js	14 KB	2026-10-03	current
https://semapps.org/assets/js/b90e232e.8b49c91c.js	js	4.7 KB	2026-10-03	current
https://semapps.org/assets/js/68785c31.8f10e0ec.js	js	8.4 KB	2026-10-03	current
https://semapps.org/assets/js/52ed3796.859d19d9.js	js	9.1 KB	2026-10-03	current
https://semapps.org/assets/js/ae287b08.3dbc1b15.js	js	12.8 KB	2026-10-03	current
https://semapps.org/assets/js/6875c492.f3ab4d7e.js	js	2.6 KB	2026-10-03	current
https://semapps.org/assets/js/aeba5b11.5b7f6145.js	js	16 KB	2026-10-03	current
https://semapps.org/assets/js/42c92932.55965d79.js	js	6.2 KB	2026-10-03	current
https://semapps.org/assets/js/37b03188.1ce55e73.js	js	7.3 KB	2026-10-03	current
https://semapps.org/assets/js/283616e4.b30080c7.js	js	13.1 KB	2026-10-03	current
https://semapps.org/assets/js/26a99cd3.cd8769f5.js	js	10.3 KB	2026-10-03	current
https://semapps.org/assets/js/73b13f10.dcae2ed3.js	js	6.2 KB	2026-10-03	current
https://semapps.org/assets/js/4c9cb9e2.60048c5a.js	js	5.1 KB	2026-10-03	current
https://semapps.org/assets/js/f7ae043b.01cf7687.js	js	7.9 KB	2026-10-03	current
https://semapps.org/assets/js/e9bba309.fb5e08cc.js	js	15.9 KB	2026-10-03	current
https://semapps.org/assets/js/fedb1f8e.e173fc68.js	js	5.8 KB	2026-10-03	current
https://semapps.org/assets/js/84707459.e5de76d6.js	js	13.3 KB	2026-10-03	current
https://semapps.org/assets/js/da89b877.5a3fee1e.js	js	20.8 KB	2026-10-03	current
https://semapps.org/assets/js/17896441.839aa30b.js	js	14.5 KB	2026-10-03	current
https://semapps.org/assets/js/3d02de94.66288c16.js	js	4.4 KB	2026-10-03	current
https://semapps.org/assets/js/88a4e741.9495bf1a.js	js	12.4 KB	2026-10-03	current
https://semapps.org/assets/js/2bb4a152.ea404643.js	js	264 B	2026-10-03	current
https://semapps.org/assets/js/d664eee3.53d47d55.js	js	12.7 KB	2026-10-03	current
https://semapps.org/assets/js/652b173d.9fc88d2f.js	js	6 KB	2026-10-03	current
https://semapps.org/assets/js/42c4afff.daa620ae.js	js	6 KB	2026-10-03	current
https://semapps.org/assets/js/e33e4c70.ddb6d409.js	js	11 KB	2026-10-03	current
https://semapps.org/assets/js/5c5e5ab7.05f32583.js	js	18 KB	2026-10-03	current
https://semapps.org/assets/js/96711af8.a7cb9ee6.js	js	29.1 KB	2026-10-03	current
https://semapps.org/assets/js/f0d07ca9.3fc0b49f.js	js	1.7 KB	2026-10-03	current
https://semapps.org/assets/js/053ac32d.ec1993ab.js	js	10.7 KB	2026-10-03	current
https://semapps.org/assets/js/92f7ceda.2fde2d2c.js	js	26.3 KB	2026-10-03	current
https://semapps.org/assets/js/75a0c64b.041a9c0e.js	js	21 KB	2026-10-03	current
https://semapps.org/assets/js/9b9fea63.36e55942.js	js	6.9 KB	2026-10-03	current
https://semapps.org/assets/js/b2849ad4.334c8d14.js	js	9.2 KB	2026-10-03	current
https://semapps.org/assets/js/e677eeb6.ab7209ae.js	js	6.6 KB	2026-10-03	current
https://semapps.org/assets/js/d97ab019.ca9a2161.js	js	6.7 KB	2026-10-03	current
https://semapps.org/assets/js/f146017a.d59f12fc.js	js	11 KB	2026-10-03	current
https://semapps.org/assets/js/640b38a3.e1f05d58.js	js	19.8 KB	2026-10-03	current
https://semapps.org/assets/js/ccc49370.f012041a.js	js	6 KB	2026-10-03	current
https://semapps.org/assets/js/d534253d.bfdbc1ae.js	js	13.8 KB	2026-10-03	current
https://semapps.org/assets/js/6f7f157e.7ecb0b15.js	js	35.3 KB	2026-10-03	current
https://semapps.org/assets/js/d8daf613.183c3cae.js	js	23.7 KB	2026-10-03	current
https://semapps.org/assets/js/e6bd93bf.822665ee.js	js	6.6 KB	2026-10-03	current
https://semapps.org/assets/js/0bfe1fd9.90b002a4.js	js	34.7 KB	2026-10-03	current
https://semapps.org/assets/js/54b213b8.fd00da81.js	js	6.7 KB	2026-10-03	current
https://semapps.org/assets/js/653e89d6.2ba20616.js	js	5.4 KB	2026-10-03	current
https://semapps.org/assets/js/e0e98d6e.8a52daf9.js	js	7.7 KB	2026-10-03	current
https://semapps.org/assets/js/77ced330.cedb1506.js	js	4.4 KB	2026-10-03	current
https://semapps.org/assets/js/b95631b6.61240744.js	js	4.8 KB	2026-10-03	current
https://semapps.org/assets/js/42068840.93d99b25.js	js	5 KB	2026-10-03	current
https://semapps.org/assets/js/2bc4bb23.7ad81095.js	js	12.2 KB	2026-10-03	current
https://semapps.org/assets/js/9f6e554e.a6080577.js	js	7.3 KB	2026-10-03	current
https://semapps.org/assets/js/4baa7f24.682efdc6.js	js	6.4 KB	2026-10-03	current
https://semapps.org/assets/js/2293b696.72a99cd3.js	js	185 B	2026-10-03	current
https://semapps.org/assets/js/642c30c1.34a6c206.js	js	10.7 KB	2026-10-03	current
https://semapps.org/assets/js/4830eed1.45ebe7c7.js	js	9.5 KB	2026-10-03	current
https://semapps.org/assets/js/eb0c7f1c.d2d76ff3.js	js	6.6 KB	2026-10-03	current
https://semapps.org/assets/js/1f0bedfe.95942435.js	js	1.2 KB	2026-10-03	current
https://semapps.org/assets/js/3e372105.e5a68eb8.js	js	9.8 KB	2026-10-03	current
https://semapps.org/assets/js/c4f5d8e4.cc6bc272.js	js	12.7 KB	2026-10-03	current
https://semapps.org/assets/js/d6e0c081.9ee6a74e.js	js	7 KB	2026-10-03	current
https://semapps.org/assets/js/23fc657c.f4a6e8a1.js	js	8.7 KB	2026-10-03	current
https://semapps.org/assets/js/a74694c5.4da9b8d3.js	js	9 KB	2026-10-03	current
https://semapps.org/assets/js/01a85c17.dbc0f2b0.js	js	3.6 KB	2026-10-03	current
https://semapps.org/assets/js/e683890b.fc2319f6.js	js	11.3 KB	2026-10-03	current
https://semapps.org/assets/js/0de4cb38.ef59ede4.js	js	29.7 KB	2026-10-03	current
https://semapps.org/assets/js/242bb1be.df6b9930.js	js	46.9 KB	2026-10-03	current
https://semapps.org/assets/js/224e591f.4199ddb6.js	js	218 B	2026-10-03	current
https://semapps.org/assets/js/9e4087bc.e361eff9.js	js	1.7 KB	2026-10-03	current
https://semapps.org/assets/js/75d94d2d.99d3851b.js	js	9.2 KB	2026-10-03	current
https://semapps.org/assets/js/0dc8426d.cacab916.js	js	15.8 KB	2026-10-03	current
https://semapps.org/assets/js/4ad8b55b.5cfcb959.js	js	5.1 KB	2026-10-03	current
https://semapps.org/assets/js/72164631.cce29d1d.js	js	5.9 KB	2026-10-03	current
https://semapps.org/assets/js/4482b79e.ad2f5408.js	js	10.5 KB	2026-10-03	current
https://semapps.org/assets/js/d33abdb0.41056a06.js	js	4.8 KB	2026-10-03	current
https://semapps.org/assets/js/a6aa9e1f.07edff68.js	js	1.9 KB	2026-10-03	current
https://semapps.org/assets/js/24dc22f0.6690d778.js	js	6.5 KB	2026-10-03	current
https://semapps.org/assets/js/9c2a653c.422ca671.js	js	28.6 KB	2026-10-03	current
https://semapps.org/assets/js/a357ca4d.0466d6b3.js	js	4.7 KB	2026-10-03	current
https://semapps.org/assets/js/266622d9.c4da5f0c.js	js	7.6 KB	2026-10-03	current
https://semapps.org/assets/js/3167aca6.b98695ec.js	js	32.1 KB	2026-10-03	current
https://semapps.org/assets/js/4e0e6e3b.79f302da.js	js	7.8 KB	2026-10-03	current
https://semapps.org/assets/js/2e327fec.7263a013.js	js	20.3 KB	2026-10-03	current
https://semapps.org/assets/js/e4e33132.67bd6a50.js	js	28.6 KB	2026-10-03	current
https://semapps.org/assets/js/1732a20b.49659f32.js	js	185 B	2026-10-03	current
https://semapps.org/assets/js/814f3328.02978a90.js	js	297 B	2026-10-03	current
https://semapps.org/assets/js/cabff09b.9358564f.js	js	6.9 KB	2026-10-03	current
https://semapps.org/assets/js/8a63e230.745731cb.js	js	2.8 KB	2026-10-03	current
https://semapps.org/assets/js/3ee613b0.b4025024.js	js	27.6 KB	2026-10-03	current
https://semapps.org/assets/js/d763fdbf.462d25c0.js	js	5.5 KB	2026-10-03	current
https://semapps.org/assets/js/4bd981ad.719606ab.js	js	10.2 KB	2026-10-03	current
https://semapps.org/assets/js/17295829.c55b9f30.js	js	18.5 KB	2026-10-03	current
https://semapps.org/assets/js/86c01ce4.6cd9e627.js	js	18 KB	2026-10-03	current
https://semapps.org/assets/js/8c8c03c2.2b288291.js	js	19.7 KB	2026-10-03	current
https://semapps.org/assets/js/a7023ddc.24afd914.js	js	193 B	2026-10-03	current
https://semapps.org/assets/js/f3c75f0f.7a85d65a.js	js	4.7 KB	2026-10-03	current
https://semapps.org/assets/js/cccd9c79.3c4a1ceb.js	js	7.3 KB	2026-10-03	current
https://semapps.org/assets/js/00aa5657.ef7ac971.js	js	6 KB	2026-10-03	current
https://semapps.org/assets/js/d015beca.bf59d3fa.js	js	13 KB	2026-10-03	current
https://semapps.org/assets/js/9d9fedb5.b7710f6b.js	js	4.6 KB	2026-10-03	current
https://semapps.org/assets/js/b2f554cd.4ae75975.js	js	28 KB	2026-10-03	current
https://semapps.org/assets/js/e4239f63.c8ab5480.js	js	10.6 KB	2026-10-03	current
https://semapps.org/assets/js/ebd6dc55.6bf46b0d.js	js	25.1 KB	2026-10-03	current
https://semapps.org/assets/js/ff22d01d.03ca970e.js	js	4.5 KB	2026-10-03	current
https://semapps.org/assets/js/cb910f91.699dc190.js	js	186 B	2026-10-03	current
https://semapps.org/assets/js/859cc09f.d855d2f7.js	js	10.3 KB	2026-10-03	current
https://semapps.org/assets/js/1bbec7fe.9210a6fb.js	js	4.5 KB	2026-10-03	current
https://semapps.org/assets/js/a33c4264.abf7d1fb.js	js	2.2 KB	2026-10-03	current
https://semapps.org/assets/js/1b79b23a.71d17c36.js	js	6.7 KB	2026-10-03	current
https://semapps.org/assets/js/d3133bb1.b1523406.js	js	7.8 KB	2026-10-03	current
https://semapps.org/assets/js/18ae105b.83fb520a.js	js	9 KB	2026-10-03	current
https://semapps.org/assets/js/307a4181.024c382d.js	js	5.3 KB	2026-10-03	current
https://semapps.org/assets/js/b2b675dd.7a88336f.js	js	250 B	2026-10-03	current
https://semapps.org/assets/js/3ca7d459.55ca6513.js	js	4.5 KB	2026-10-03	current
https://semapps.org/assets/js/935f2afb.f4ad582a.js	js	32.7 KB	2026-10-03	current
https://semapps.org/assets/js/main.d3440077.js	js	391.7 KB	2026-10-03	current
https://semapps.org/assets/js/runtime~main.42d4bdef.js	js	9.7 KB	2026-10-03	current
https://semapps.org/docs/middleware	html	17.2 KB	2026-10-03	current
https://semapps.org/team	html	30.1 KB	2026-10-03	current
https://semapps.org/docs/guides/ldp-server	html	40.9 KB	2026-10-03	current
https://semapps.org/blog	html	48.3 KB	2026-10-03	current
https://semapps.org/	html	42.3 KB	2026-10-03	current

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.

2026-10-03 first crawl

5 pages, 139 files, 2.5 MB; 20 libraries, 0 identifiers, 132 third-party hosts
20 libraries added
- @vitest/utils 5.0.2
- @ant-design/x 2.9.0
- @inkeep/cxkit-js 0.5.119
- @wix/image 1.454.0
- prismjs 1.30.0
- bromcom-ui 2.12.3
- graphql-playground-react 1.7.28
- kifu-for-js 5.5.0
- arv-extends 5.0.3-status-track-1.71
- @collectionspace/cspace-public-browser 4.0.0
- @accusoft/pdf-viewer 3.11.158639
- scanbot-web-sdk 9.0.0
- and 8 more
132 third-party hosts added
- www.w3.org
- docusaurus.io
- webplatform.github.io
- reactjs.org
- github.com
- forums.assemblee-virtuelle.org
- chat.lescommuns.org
- www.drupal.org
- mydomain.com
- www.linkedin.com
- virtual-assembly.org
- flod.io
- and 120 more
139 files added

Questions about semapps.org

How does PageSourceSearch know what semapps.org 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 semapps.org 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 semapps.org?: 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 semapps.org?: 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.