How does PageSourceSearch know what leapp.nl 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 leapp.nl 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 leapp.nl?

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 leapp.nl?

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

leapp.nl

Built with preact 10.29.8, bootstrap-table 1.27.3, @vitest/utils 5.0.2, @recogito/annotorious 2.7.14, cobrowse-sdk-js 3.28.7. 5 pages and 200 stored files, last crawled 2026-10-04.

rank 10,023,241 5 libraries 1 identifier 49 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
preact	10.29.8	2026-10-04
bootstrap-table	1.27.3	2026-10-04
@vitest/utils	5.0.2	2026-10-04
@recogito/annotorious	2.7.14	2026-10-04
cobrowse-sdk-js	3.28.7	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
Facebook domain verification (Meta)	abdqr49sfbuw3whtugr715dolvqjxj	view source

Third-party hosts

Hosts outside leapp.nl 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
admin.shopify.com	connect	view source
aka.ms	connect	view source
app.shopify.com	connect	view source
atlas.shopifysvc.com	connect	view source
cdn.shopify.com	script stylesheet connect	view source
checkout.pci.shopifyinc.com	connect	view source
checkout.shopify.com	connect	view source
connect.facebook.net	connect	view source
content.global-e.com	connect	view source
error-analytics-production.shopifysvc.com	connect	view source
error-analytics-sessions-production.shopifysvc.com	connect	view source
europesnus.de	connect	view source
europesnus.fr	connect	view source
europesnus.nl	connect	view source
europesnus.se	connect	view source
extensions.shopifycdn.com	connect	view source
fr.stance.eu.com	connect	view source
frontend-event-collector-staging.shopifysvc.com	connect	view source
frontend-event-collector.shopifysvc.com	connect	view source
github.com	connect	view source
go.microsoft.com	connect	view source
help.shop.app	connect	view source
help.shopify.com	connect	view source
holysmile.de	connect	view source
js.hcaptcha.com	connect	view source
monorail-edge-ca.shopifycloud.com	connect	view source
monorail-edge-staging.shopifycloud.com	connect	view source
monorail-edge.shopifysvc.com	connect	view source
notify.bugsnag	connect	view source
otlp-http-production.shopifysvc.com	connect	view source
pay.shopify.com	connect	view source
payments.google.com	connect	view source
privacy.shopify.com	connect	view source
redacted.invalid	connect	view source
server.shop.app	connect	view source
services.nofraud.com	script	view source
shop-server.shop.dev	connect	view source
shop.app	connect	view source
shopify.dev	connect	view source
suomi-nikotiinipussit.fi	connect	view source
support.google.com	connect	view source
ucp.dev	connect	view source
www.facebook.com	connect	view source
www.gstatic.com	script	view source
www.lankeleisi.se	connect	view source
www.shopify.com	connect	view source
www.suomi-nikotiinipussit.fi	connect	view source
www.truemed.com	connect	view source
www.w3.org	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 200) }. 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://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/5b932bed.DZsuMgsx.js	js	138.4 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/5ab17cb1.DZsuMgsx.js	js	138.4 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/af0b6f88.Ckz0usnS.js	js	142.9 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/77881163.DbATOKlW.js	js	250.2 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/49853601.Df4I7oCW.js	js	151.6 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/fb92354f.DJc7vBfV.js	js	160.8 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/3b61b22d.C5mDsWFZ.js	js	151.7 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/3000570c.CRpBG5wm.js	js	270.2 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/fda1b4ec.BNY3Y0JC.js	js	167.9 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/57c6da58.CyGyKEyd.js	js	153.2 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/53eeda66.B0KQVRcf.js	js	141.2 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/64c2073d.DwbJdOR-.js	js	155.4 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/b7eb663a.B7SSNNli.js	js	150.7 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/5d9b711a.IRG6o_jK.js	js	249.9 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/548e1363.CGdB2c6i.js	js	176.7 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/4f72f047.qZteZHuk.js	js	246.5 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/e0a38893.BrbjUiT0.js	js	147.6 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/ecbc70a8.B45CrSzR.js	js	162.1 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/c634cc5e.7qgjkXVz.js	js	143 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/d1dd5293.BMgqvSbn.js	js	145.1 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/62b3a8b6.qIYz81X_.js	js	137.1 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/c639b2b4.oYURHbyw.js	js	153.2 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/fb3b4968.CfrqMjFZ.js	js	133.4 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/80d1e007.SOz2MWyb.js	js	225.2 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/7e6e4a02.DnAoJryJ.js	js	152.1 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/4245a218.Dwm1vYpg.js	js	139.5 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/1ccd47ca.C3OyleZc.js	js	159.2 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/649d5d60.CzVPctmg.js	js	149.9 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/1c89a5aa.LkGCQi0i.js	js	257.9 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/4c5bcdd0.23I-CHuv.js	js	209.6 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/25462807.Cl3iiqzj.js	js	206.4 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/6f1b819b.BcGHDpfD.js	js	88.3 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/711bf263.CXsAdxw9.js	js	29.9 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/948fe603.pkKx_isN.js	js	12.5 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/2689105d.CRqe5WRx.js	js	24.5 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/2b0dcdd4.CYIZgWvK.js	js	90.3 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/4b77f49a.C1s0kVMd.js	js	14.8 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/d2e6a587.Dn0L4cvy.js	js	12.7 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/3a819064.DvJdzPv7.js	js	1.4 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/b9c0319a.CIGlacbX.js	js	3.1 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/c10167e6.DW7aL1mi.js	js	11.4 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/7ee73f43.QtnstTj2.js	js	2.3 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/1ed8f5e3.DkmKdCgD.js	js	972 B	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/4ea44c06.Cj0Sc_bl.js	js	9.5 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/fc21c11a.Dku7sbdq.js	js	70.1 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/e0989459.DW399CzT.js	js	1.3 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/f692f62f.DHgy7Fzw.js	js	105 B	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/7114e006.DxMyqTAB.js	js	25.4 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/86720dbb.DHZl5FAg.js	js	129.5 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/91319467.DpeMFOvW.js	js	3.1 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/73a9b0a0.gCS2W2-n.js	js	12.4 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/5fd968f2.BwKCnifP.js	js	6 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/a535174a.DPVRr5eA.js	js	4.3 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/7aefefff.BlVjin5V.js	js	21.7 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/a25deb9a.BE5O6zot.js	js	1.6 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/f3e117aa.DNg1dGVr.js	js	3.3 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/90e26f5f.C0yU_UAv.js	js	8.1 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/8e79be58.DbjZmhsu.js	js	7.1 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/64de7b49.yFRdciMn.js	js	5.3 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/f51e663e.Cb7U9v8A.js	js	4.3 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/d6447d9e.BtUd7XAf.js	js	8.5 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/181d38d3.bNzFxA5T.js	js	2.8 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/d5d34b3b.D0jJQL_d.js	js	1.3 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/347b440c.-JodZrUc.js	js	10 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/910cd6e2.C--KAxpp.js	js	4.5 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/b684bff6.FsqZYmPf.js	js	3.2 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/2b89a178.dq9bza6T.js	js	4.6 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/7a8217fd.C-KSXAi3.js	js	2.8 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/58314944.D85q6ENI.js	js	2.3 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/01973ac7.hFyCq2Rp.js	js	5.7 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/6720fa5f.B84Z8I3K.js	js	9.2 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/dfca5da5.BJQx_CCE.js	js	2 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/87bfafec.4CtkSIvo.js	js	1.3 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/cc6ff67d.D2x8Yxrg.js	js	5.6 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/e77f7fe0.BZPIxVUE.js	js	8.5 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/598fef4e.Blg5kMTg.js	js	5.4 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/f3fe2775.Cg8b5yuM.js	js	79.6 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/ec391382.CdHY2UiR.js	js	2.4 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/39921a74.BMGPgeDG.js	js	2.3 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/0e9ee714.BUAjwk_6.js	js	13.1 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/f49d4216.C2ooXZfg.js	js	1.6 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/d22d2b80.CPLrR--0.js	js	11.4 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/7b0c98ea.B54fWMkZ.js	js	1.5 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/79974aab.DPBsbYrf.js	js	2.3 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/a422df8c.B9fLTQ4u.js	js	1.6 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/ccdf3592.y_I-TghG.js	js	2.6 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/ed9f2238.BDG257lM.js	js	5.2 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/ca5e9c49.DIuWAPOX.js	js	1.5 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/e3e348f2.DAaElZ9-.js	js	8.7 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/cb5cf153.CBk88ZOK.js	js	5.1 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/55098bf1.SNyaSeYe.js	js	1.6 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/f1968089.lfvhhPdb.js	js	1.9 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/efa0389a.ZcaEqvMP.js	js	12.9 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/064f6ac1.DPGuEQ9h.js	js	3.5 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/0727407f.DihGPUji.js	js	2.3 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/47b970b2.C6dKnXeF.js	js	3.8 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/ac5a19ff.BchXgW63.js	js	2.2 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/29034f35.DARWjbfB.js	js	2.1 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/74835653.DeaMa2xw.js	js	62.5 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/0e67bd3b.DUa61rto.js	js	3.5 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/2fdb3dd3.DyNzUnPi.js	js	3.7 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/945a08d6.c61SBjtG.js	js	1.6 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/53bbdad9.oGVvLPt2.js	js	2.9 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/0c0ad074.Dl7fvU-G.js	js	1.4 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/31cc568e.CVMsqQ1x.js	js	6.5 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/dffdfb34.5SAJ7sQR.js	js	111.1 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/f8706cb6.Dq4SNRnK.js	js	168.6 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/345b47ce.C6BhD5Ub.js	js	145.5 KB	2026-10-04	2026-10-04
https://leapp.nl/cdn/shopifycloud/checkout-web/assets/c1/21cc90a2.Ccyorzx_.js	js	1.4 KB	2026-10-04	2026-10-04
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https://leapp.nl/collections/refurbished-macbook	html	1.1 MB	2026-10-04	2026-10-04
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https://leapp.nl/	html	691 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, 200 files, 12.6 MB; 5 libraries, 1 identifier, 49 third-party hosts
5 libraries added
- @vitest/utils 5.0.2
- bootstrap-table 1.27.3
- cobrowse-sdk-js 3.28.7
- @recogito/annotorious 2.7.14
- preact 10.29.8
1 identifier added
- abdqr49sfbuw3whtugr715dolvqjxj Facebook domain verification
51 third-party hosts added
200 files added

Questions about leapp.nl

How does PageSourceSearch know what leapp.nl 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 leapp.nl 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 leapp.nl?: 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 leapp.nl?: 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.