How does PageSourceSearch know what qiagen.com 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 qiagen.com 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 qiagen.com?

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 qiagen.com?

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

qiagen.com

Built with @clerk/clerk-js 6.33.0, @wix/design-system 1.328.0, @pine-ds/core 4.0.0, @findify/bundle 7.1.108, jssocials 1.5.0, addsearch-search-ui 0.10.9, vviinn-widgets 2.224.3, swagger-ui-dist 5.33.0, @raisenow/tamaro-core 2.19.3, recaptcha, @reachfive/identity-ui 2.1.0, @cognigy/webchat 3.50.0 and more. 5 pages and 110 stored files, last crawled 2026-10-09.

39 libraries 1 identifier 31 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
@clerk/clerk-js	6.33.0	2026-10-09
@wix/design-system	1.328.0	2026-10-09
@pine-ds/core	4.0.0	2026-10-09
@findify/bundle	7.1.108	2026-10-09
jssocials	1.5.0	2026-10-09
addsearch-search-ui	0.10.9	2026-10-09
vviinn-widgets	2.224.3	2026-10-09
swagger-ui-dist	5.33.0	2026-10-09
@raisenow/tamaro-core	2.19.3	2026-10-09
recaptcha		2026-10-09
@reachfive/identity-ui	2.1.0	2026-10-09
@cognigy/webchat	3.50.0	2026-10-09
vite	8.3.1	2026-10-09
core-js		2026-10-09
events		2026-10-09
jquery-cookie	1.4.1	2026-10-09
babel-runtime		2026-10-09
headjs	1.0.3	2026-10-09
html2pdf.js	0.14.0	2026-10-09
dzxstatic	3.4.20211231	2026-10-09
date-holidays	3.37.0	2026-10-09
volantis-static	0.0.1761982841160	2026-10-09
@recogito/annotorious	2.7.14	2026-10-09
lg-zoom.js	1.3.0	2026-10-09
stackedboost-shopify-assets	0.2.0	2026-10-09
@genpact/genome.mfe.solidify-app	3.15.1	2026-10-09
@getopenpay/openpay-js	0.5.25	2026-10-09
files.photo.gallery	0.15.3	2026-10-09
@configcat/sdk	1.1.0	2026-10-09
cobrowse-sdk-js	3.28.7	2026-10-09
jquery-storelocator-plugin	3.4.0	2026-10-09
@everymatrix/player-profile-dashboard	1.21.0	2026-10-09
@formbird/angular-elements	8.5.10	2026-10-09
wonder-image	2.1.2-alpha.4	2026-10-09
jquery-select-areas	0.1.0	2026-10-09
chizen	1.0.0	2026-10-09
genesys-cloud-webrtc-sdk	14.2.4	2026-10-09
timepicki	2.0.1	2026-10-09
jcarouselswipe	0.3.7	2026-10-09

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
reCAPTCHA site key (Google)	6LcqqdsUAAAAAFwa__RlqGkmmbtqWkbBQNGcjYHH	view source

Third-party hosts

Hosts outside qiagen.com 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
addons.mozilla.org	connect	view source
angular.dev	connect	view source
assets.adobedtm.com	script	view source
breeze.aimon.applicationinsights.io	connect	view source
cdn.userway.org	connect	view source
cdnjs.cloudflare.com	connect	view source
chrome.google.com	connect	view source
dc-int.services.visualstudio.com	connect	view source
dc.services.visualstudio.com	connect	view source
dev04-qia-campaign-landing-page-appfunc.azurewebsites.net	connect	view source
dev04-qia-faqconsumer-weu-appfunc.azurewebsites.net	connect	view source
dev04-qia-pagecontent-weu-appfunc.azurewebsites.net	connect	view source
dev04-router.da.qiagen.ads	connect	view source
dev12qiasocpubweust.blob.core.windows.net	connect	view source
dev13.da.qiagen.ads	connect	view source
edge-platform.sitecorecloud.io	connect	view source
event.on24.com	connect	view source
github.com	connect	view source
img.en25.com	connect	view source
pages.sitecorecloud.io	connect	view source
picsum.photos	connect	view source
policies.google.com	connect	view source
pubmed.ncbi.nlm.nih.gov	connect	view source
qiagen.leadfamly.com	connect	view source
qiagennv2021rd.q4web.com	connect	view source
schema.org	connect	view source
static.hotjar.com	connect	view source
www.bizgeniusapp.com	connect	view source
www.recaptcha.net	script connect	view source
www.w3.org	connect	view source
www.youtube.com	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 110) }. 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://cdnjs.cloudflare.com/ajax/libs/jquery-cookie/1.4.1/jquery.cookie.min.js	js library	not fetched	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/web-componen…og_c-72e7f8.01f7a973520f219b.js	js	56.5 KB	2026-10-09	2026-10-09
https://www.recaptcha.net/recaptcha/api.js	js library	not fetched	2026-10-09	2026-10-09
https://www.recaptcha.net/recaptcha/api.js?onload=onCaptchaLoadCallback	js library	not fetched	2026-10-09	2026-10-09
https://www.recaptcha.net/recaptcha/api.js?rende…AAAAFwa__RlqGkmmbtqWkbBQNGcjYHH	js library	not fetched	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_resourc…n_module_ts.d73baffa883f2d14.js	js	32.7 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_tools_s…r_module_ts.ffbf7b5baa304154.js	js	3.7 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_tools_s…t_module_ts.59b86a5d0a0cbac3.js	js	4 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_registr…n_module_ts.66d51db17778d545.js	js	162.5 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-apps…s_sr-cca925.a44a8ac6c4fa930b.js	js	307.8 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_faqs_sr…n_module_ts.e1bebbb179bd5f13.js	js	42.2 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_ks-reso…n_module_ts.a9f8ea0f8b3678c3.js	js	37.5 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_search3…d_module_ts.136ad02fa50eb66d.js	js	875 B	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_search3…e_module_ts.e19238bb04d8a317.js	js	60.9 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_search4…d_module_ts.c80b63838f0c5db5.js	js	878 B	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_search4…omponent_ts.07ffed192551b88d.js	js	26.5 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_search4…e_module_ts.be9fdcc9ba9d0cb2.js	js	31 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_kh-sear…n_module_ts.5c17cc57d269a859.js	js	8 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_kh-sear…s_module_ts.720b5f990fdec737.js	js	7.6 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_kh-sear…d_module_ts.85263043881e23b1.js	js	7.9 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_kh-sear…s_module_ts.6df9e88322b5d1e0.js	js	25.1 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_kh-sear…s_module_ts.a4df390ff37514bc.js	js	7.6 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_kh-sear…h_module_ts.4ee73e1896d36f27.js	js	7.5 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_kh-sear…s_module_ts.13980f478ea26c35.js	js	8.1 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_kh-sear…e_module_ts.70aff8e61eb8eeec.js	js	7.4 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-apps…onen-9b76e0.b7f4a4095a58a0a0.js	js	23.3 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/web-componen…t_module_ts.1fdcd2c6629f178f.js	js	1.3 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_product…s_module_ts.d5f60cd9eb378b91.js	js	12.1 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_product…red--94d188.7b56aef34ca065b0.js	js	12.8 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/web-componen…layerAPI_js.553ae0fa84d92e05.js	js	68.9 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/node_modules…_lg-zoom_js.cd718ffc10d02125.js	js	11.3 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/node_modules…llscreen_js.3baa57fddde47f88.js	js	2.5 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/node_modules…tgallery_js.3e52c2ded289653d.js	js	24.2 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/web-componen…a_module_ts.3a9fc483cd3d943d.js	js	407 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/web-componen…t_module_ts.8acdc1134fa1f394.js	js	57 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_root_sr…d_module_ts.d148e513df601bc3.js	js	7.7 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_sales-o…omponent_ts.1a22a29a56815b4a.js	js	23.3 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_root_sr…s_module_ts.4abeb9d2457b9a22.js	js	10.4 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_resourc…p_module_ts.c5fae6fafb22d4a3.js	js	1.5 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_webinar…p_module_ts.bdf6490aba608a66.js	js	97 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_homepag…p_module_ts.9b9c20483b7b9927.js	js	38.5 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_help-ce…omponent_ts.9882acf1813a9543.js	js	31.5 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-web-…e_ts-4d874a.ddea4795be9e2c57.js	js	14.1 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_content…cont-de0c92.5daf033d64aeb77c.js	js	38.2 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_tools_s…p_module_ts.0d7b37855419b1a5.js	js	12.8 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_promoti…e-ev-19ceb4.d98cd1f48df7b34f.js	js	31.3 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_registr…p_module_ts.4554dca556639854.js	js	9.1 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_faqs_sr…p_module_ts.f1e58ef26b55df4e.js	js	1.3 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_ks-reso…p_module_ts.850f2dd3f2b6ff5b.js	js	917 B	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_sds-sea…p_module_ts.c28cd315e62fb23e.js	js	22.7 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-web-…n_module_ts.f9e5688ec3ca2d7b.js	js	13.8 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_cofa-se…p_module_ts.bd129f3e146de57a.js	js	31.2 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-libs…red_-c8445c.8ee88cf62846f114.js	js	21.7 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-web-…ompo-516f2d.836b17a6a5aeb56c.js	js	14.8 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_search3…p_module_ts.22d077b94414fb8c.js	js	37.4 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-web-…-web-a72503.2d4b9bbda29b1d9a.js	js	786.9 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_kh-sear…p_module_ts.8f564fd3daca3cdb.js	js	15.9 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_search4…p_module_ts.afdc0f676925e98f.js	js	101.6 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_product…p_module_ts.44c37a474d59073c.js	js	403.7 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-web-…y_module_ts.eb01e369497a8b81.js	js	26.2 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-web-…nts--ec91b9.db2290891af5849e.js	js	38.2 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-node…sm20-4f3381.b1f0dbc8e397bf27.js	js	81.7 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-node…t_moment_js.88ffee76f084f2e5.js	js	378.3 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_product…p_module_ts.d355203a4fac8328.js	js	127.6 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_product…p_module_ts.9d8ab6975b3ba4d6.js	js	95 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-web-…omponent_ts.1374f6c94a867cc1.js	js	30.6 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-web-…ule_-e2db82.9c415b5d9452f663.js	js	40.6 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-web-…-com-9b0249.e4398413a0b0b374.js	js	41.8 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-web-…e_module_ts.b28c5609da1fd88e.js	js	12.8 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-web-…omponent_ts.4dc8d36b7d862fce.js	js	25 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-libs…red_-ea42e8.a6e0a5dfc9266b73.js	js	14.8 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-web-…o_module_ts.36ba37208300eced.js	js	13.4 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-libs…ibs_-1b090a.97688a198e8432d4.js	js	12 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-web-…pone-80b4d7.99f3ecb5c6910310.js	js	15.4 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-web-…web--e35ef3.1909e3a372e29061.js	js	32.5 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-node…wrapper_mjs.07358fbc144ebd40.js	js	178.9 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/apps_product…2_badge_mjs.e575ee6f3e407bb3.js	js	104.1 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/common.c4a306d7081de4fd.js	js	37.1 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-libs…ngul-369e15.3de63c4b52d7709e.js	js	17.6 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-node…22_menu_mjs.e77756af77c1947e.js	js	23.8 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-web-…t_module_ts.fd35da5a526f32af.js	js	29.1 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-node…ack-bar_mjs.8a89ed81761baf0c.js	js	14.6 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/default-node…22_list_mjs.14e94375574741b7.js	js	61.7 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-cloud/dist/browser/839.e6ce7401fda9c409.js	js	68.8 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-cloud/dist/browser/805.6dbaed40e0d3081e.js	js	24.1 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-cloud/dist/browser/277.218d689d1e0eeab9.js	js	59 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-cloud/dist/browser/315.24cfe64c50f28344.js	js	2.5 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-cloud/dist/browser/143.70c95b82821673dc.js	js	11.3 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-cloud/dist/browser/136.8f3ca938a6bbfb1d.js	js	56.4 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-cloud/dist/browser/120.8e33e18f5d2bbb11.js	js	492.3 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/main.961af03b9bbeee56.js	js	2.3 MB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/polyfills.847ce4096f2a1e9d.js	js	81.7 KB	2026-10-09	2026-10-09
https://login.qiagen.com/themes/qiagen/js/eloqua-tracking.js	js	516 B	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-fronts/runtime.171a6553fdd32743.js	js	10.2 KB	2026-10-09	2026-10-09
https://login.qiagen.com/themes/qiagen/js/cas.js	js	3.7 KB	2026-10-09	2026-10-09
https://login.qiagen.com/themes/qiagen/js/head-1.0.3.min.js	js library	9.5 KB	2026-10-09	2026-10-09
https://login.qiagen.com/themes/qiagen/js/eloqua-polling.js	js	824 B	2026-10-09	2026-10-09
https://login.qiagen.com/themes/qiagen/js/one-data-layer.js	js	3.4 KB	2026-10-09	2026-10-09
https://login.qiagen.com/themes/qiagen/js/hotjar.js	js	531 B	2026-10-09	2026-10-09
https://login.qiagen.com/themes/qiagen/js/jquery.cookie-1.4.1.min.js	js library	1.3 KB	2026-10-09	2026-10-09
https://login.qiagen.com/themes/qiagen/js/jquery-ui-1.11.4.min.js	js library	234.8 KB	2026-10-09	2026-10-09
https://login.qiagen.com/themes/qiagen/js/jquery-1.11.3.min.js	js	93.7 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-cloud/dist/browser/main.750d3313440ce53f.js	js	3.4 MB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-cloud/dist/browser/polyfills.0d59c7ab9f878c8f.js	js	53.9 KB	2026-10-09	2026-10-09
https://login.qiagen.com/login?service=https%3A%…%2Fpersonal-details&method=POST	html	20.5 KB	2026-10-09	2026-10-09
https://www.qiagen.com/atlas-cloud/dist/browser/runtime.7f0b760db6f8f3d1.js	js library	3.4 KB	2026-10-09	2026-10-09
https://www.qiagen.com/us/products	html	462 KB	2026-10-09	2026-10-09
https://login.qiagen.com/login?service=https://www.qiagen.com/us/dashboard	html	20.4 KB	2026-10-09	2026-10-09
https://www.qiagen.com/us/knowledge-and-support/…lity-and-safety-data/sds-search	html	562.8 KB	2026-10-09	2026-10-09
https://www.qiagen.com/us	html	759 KB	2026-10-09	2026-10-09

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.

2026-10-09 first crawl

5 pages, 110 files, 13.2 MB; 39 libraries, 1 identifier, 31 third-party hosts
39 libraries added
- recaptcha
- stackedboost-shopify-assets 0.2.0
- @formbird/angular-elements 8.5.10
- @everymatrix/player-profile-dashboard 1.21.0
- @getopenpay/openpay-js 0.5.25
- genesys-cloud-webrtc-sdk 14.2.4
- @configcat/sdk 1.1.0
- @recogito/annotorious 2.7.14
- swagger-ui-dist 5.33.0
- vite 8.3.1
- @raisenow/tamaro-core 2.19.3
- cobrowse-sdk-js 3.28.7
- and 27 more
1 identifier added
- 6LcqqdsUAAAAAFwa__RlqGkmmbtqWkbBQNGcjYHH reCAPTCHA site key
32 third-party hosts added
110 files added

Questions about qiagen.com

How does PageSourceSearch know what qiagen.com 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 qiagen.com 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 qiagen.com?: 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 qiagen.com?: 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.