How does PageSourceSearch know what creativeplanning.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 creativeplanning.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 creativeplanning.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 creativeplanning.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

creativeplanning.com

Built with gtm, @clerk/ui 1.34.0, @zonos/elements 1.3.289, masonry-layout 4.2.2, @splinetool/runtime 2.0.56, altcha 3.2.3, @blotoutio/providers-blotout-consent-sdk 1.73.0, dashjs 5.2.1, @tabler/core 1.5.1, @feathery/react 2.96.0, recaptcha, @reachfive/identity-core 1.42.0 and more. 5 pages and 120 stored files, last crawled 2026-10-09.

44 libraries 1 identifier 35 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		2026-10-09
@clerk/ui	1.34.0	2026-10-09
@zonos/elements	1.3.289	2026-10-09
masonry-layout	4.2.2	2026-10-09
@splinetool/runtime	2.0.56	2026-10-09
altcha	3.2.3	2026-10-09
@blotoutio/providers-blotout-consent-sdk	1.73.0	2026-10-09
dashjs	5.2.1	2026-10-09
@tabler/core	1.5.1	2026-10-09
@feathery/react	2.96.0	2026-10-09
recaptcha		2026-10-09
@reachfive/identity-core	1.42.0	2026-10-09
@reachfive/identity-ui	2.1.0	2026-10-09
jspdf	4.2.1	2026-10-09
mdbootstrap	4.20.0	2026-10-09
isotope-layout	3.0.6	2026-10-09
paymob-pixel	1.2.7	2026-10-09
google-maps		2026-10-09
packery	3.0.0	2026-10-09
formiojs	4.21.7	2026-10-09
universalviewer	4.4.4	2026-10-09
jsxgraph	1.13.3	2026-10-09
keen-tracking	5.0.1	2026-10-09
threejs-components	0.0.30	2026-10-09
@moveo-ai/web-client	0.117.0	2026-10-09
jquery.flipster	1.1.6	2026-10-09
ovenplayer	0.10.54	2026-10-09
graphql-playground-react	1.7.28	2026-10-09
@vitest/utils	5.0.2	2026-10-09
@recogito/annotorious	2.7.14	2026-10-09
guidechimp	5.0.5	2026-10-09
3dmol	2.5.5	2026-10-09
docusaurus-plugin-drawio	0.4.0	2026-10-09
@memori.ai/memori-webcomponent	8.3.3	2026-10-09
ali-oss	6.23.0	2026-10-09
@ant-design/x	2.9.0	2026-10-09
aframe	1.8.0	2026-10-09
chobitsu	1.8.6	2026-10-09
@3t-transform/threeteeui	1.12.1	2026-10-09
@crystaldesign/diva-core	26.11.0	2026-10-09
@inkeep/agents-ui-js-cloud	0.17.8	2026-10-09
@joyfill/components	4.0.0-rc26	2026-10-09
@grigorov-it/mazer	2.2.0	2026-10-09
@perceptimagery/sprie-widget	1.3.3015	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
Google Tag Manager container (Google)	GTM-MVT67QC	view source

Third-party hosts

Hosts outside creativeplanning.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
altcha.org	connect	view source
assets.calendly.com	script connect	view source
bsky.app	connect	view source
calendly.com	connect	view source
cdn.userway.org	script	view source
d20xtzwzcl0ceb.cloudfront.net	connect	view source
d3uc069fcn7uxw.cloudfront.net	connect	view source
facebook.com	connect	view source
github.com	connect	view source
google.com	connect	view source
images.unsplash.com	connect	view source
instagram.com	connect	view source
json-schema.org	connect	view source
linkedin.com	connect	view source
maps.google.com	connect	view source
maps.googleapis.com	script	view source
openobserve.ai	connect	view source
player.vimeo.com	connect	view source
profiles.wordpress.org	connect	view source
react.dev	connect	view source
savvycal.com	connect	view source
schema.org	connect	view source
server.fillout.com	connect	view source
svelte.dev	connect	view source
threads.net	connect	view source
tiktok.com	connect	view source
use.typekit.net	stylesheet	view source
wa.me	connect	view source
www.datad0g-browser-agent.com	connect	view source
www.datadoghq-browser-agent.com	connect	view source
www.google.com	script connect	view source
www.googletagmanager.com	iframe	view source
www.w3.org	connect	view source
www.youtube.com	connect	view source
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 120) }. 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://creativeplanning.com/wp-content/plugins/…ice.5bf227a47e9653506c33.min.js	js	754 B	2026-10-09	2026-10-09
https://maps.googleapis.com/maps/api/js?key=AIza…&libraries=places	js library	not fetched	2026-10-09	2026-10-09
https://www.google.com/recaptcha/api.js?hl=en&&v…c228c438b95e4376ce0598c261f79ca	js library	not fetched	2026-10-09	2026-10-09
https://www.googletagmanager.com/gtm.js?id=GTM-MVT67QC	js library	not fetched	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…one.7553db1f91eda7175a3e.min.js	js	59.5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…ker.5364935771613a5ba86a.min.js	js	123.7 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…ify.b0876f45cc06deeb8174.min.js	js	20.4 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…les.e978fe83ef5b00270c4e.min.js	js	578 B	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…ter.59f1a33ff7453cb272a5.min.js	js	2 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…ess.287450725f30cf9793d4.min.js	js	834 B	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…ask.3bb8e42e988e4018853f.min.js	js	1.8 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…cts.d12f93274b29433f6b30.min.js	js	6.4 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…ion.0d16164a5d2758fdcfe4.min.js	js	5.8 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…-js.8840e6a595fcd7a52d2e.min.js	js	174.9 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/9922.ba888ed9e227d2b9.js	js	3.3 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/9916.092fff420cfa6800.js	js	1 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/9845.21815e72ad7d739a.js	js	3.8 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/9766.33d95a0a312b2194.js	js	2.5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/9307.00b8c8ba7a67d8a7.js	js	173.3 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/9186.cf1f1ea0dfd8e4a7.js	js	2.3 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/8464.33c8e3220f0727ba.js	js	13 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/8404.11cba85b858b2bde.js	js	13.8 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/8200.3e063069a2fd78e2.js	js	6.5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/7856.db83ce3f5993497a.js	js	6 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/7780.323026450ce9463e.js	js	1.4 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/7304.0f30f1b997caf31c.js	js	1.5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/7046.96da14da9bfb78de.js	js	2.6 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/7028.cb861753c84b52e9.js	js	2.2 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/6738.a94a366398dfc5b1.js	js	2.1 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/6432.d5fb528f1f026f06.js	js	5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/6140.88c378867c26a340.js	js	13.1 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/6108.c4b5f61822e41c1d.js	js	2.7 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/6038.74a97b2e80bea9a6.js	js	3.5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/5956.4ab8f2ee4f6a833c.js	js	6.3 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/5666.db6f867aa3b180f7.js	js	881 B	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/5226.f1ab0f95c272c021.js	js	3.6 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/3932.61177deb7d8e673c.js	js	2.9 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/3692.60ee1553a97b4c6c.js	js	1.2 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/3301.c5571d671b6465ae.js	js	13.9 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/2899.feb2834016bf1d46.js	js	13.1 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/2698.3a6850579ce78eb8.js	js	7.1 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/2691.e9b3ec4dcfce2294.js	js	104.2 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/2421.55e53ea2940e00e0.js	js	3.1 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/1700.d5f7bf8d3905e932.js	js	4.7 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/756.04ac901f4f715f60.js	js	3.5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/716.6572c2cfee8c8db3.js	js	1.8 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/644.b8f684ca65a09a64.js	js	80.7 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/532.1ca2b79c56bb4508.js	js	919 B	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/380.050cb56f66499ac6.js	js	1.2 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/recorder.eaa8f96c63a3ee75.js	js	19.9 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/c986ad15.f9b6563106a73460.js	js	109.5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/62d0f9f2.a1b151b07af2eb38.js	js	353.5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/a8d10554.4017df5c9e67f90e.js	js	322.6 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/profiler.76029f20b49260d0.js	js	8.2 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/9051-795cfe0aada2ca3c.js	js	57.5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/392-87e14177741c7edb.js	js	86.8 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/1910-f4337e7774d8674f.js	js	50.2 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/4982-680ccb537ecb4b6e.js	js	85.6 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/267-b92f4d77904e2983.js	js	162.3 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/6263-17d712ac9425b961.js	js	6.6 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/4021-3451059f3dd81486.js	js	36.3 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/6302-f664ebe49e0542fb.js	js	117.7 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/5297-4de7b4474f65f28b.js	js	14.7 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/3146-8cd8be367342fc4b.js	js	96.6 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/c4AKeIZX5_LpIvjrR-k3s/_ssgManifest.js	js	80 B	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/c4AKeI…/_buildManifest.js	js	1.5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/uploads/…df1d2ec29cc99f3a1d2c980ae17dbe8	js	80.2 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…/isotope.pkgd.min.js?ver=3.0.1	js	33.9 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…magesloaded.min.js?ver=2.11.1.1	js	5.5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/uploads/…b19bef9b04322b46f283b1d4dcc58c2	js	35.8 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/uploads/…64833a9f8b6ddce7be64fef7558d879	js	38.1 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…ogle-analytics.min.js?ver=2.4.1	js	4.1 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-includes/js/wp-a…c228c438b95e4376ce0598c261f79ca	js	2.5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…73fcf115e257ba62fdd1a205717b981	js	78.1 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…c901cb641ce64b99c20ea1a4d208cc9	js	79.2 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…7e103405223e60d2719f4c330fd11cf	js	59.5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…holders.jquery.min.js?ver=3.1.3	js	4.5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…ditional_logic.min.js?ver=3.1.3	js	10.2 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…/gravityforms.min.js?ver=3.1.3	js	41.1 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…/jquery.json.min.js?ver=3.1.3	js	1.8 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-includes/js/dist…?ver=31c6cec5a4ff7aff483d	js	2.6 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-includes/js/dist…?ver=1dfe7db3940c23ea9216	js	5.7 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-includes/js/dist…?ver=f0f188028580e8dc1255	js	5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-includes/js/dist…?ver=3fe927cab37bf38d6a23	js	881 B	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…/assets/public.js?ver=2.4.4	js	25.9 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…/maxmegamenu.min.js?ver=3.10.8	js	20.3 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-includes/js/hoverIntent.min.js?ver=1.10.2	js	1.5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/themes/g…igation-search.min.js?ver=3.6.1	js	2.1 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/themes/g…/js/menu.min.js?ver=3.6.1	js	7.2 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/themes/g…/js/reskin.js?ver=1788228051	js	5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/themes/g…c228c438b95e4376ce0598c261f79ca	js	1.3 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/themes/g…c228c438b95e4376ce0598c261f79ca	js	845 B	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/themes/g…c228c438b95e4376ce0598c261f79ca	js	578 B	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/themes/g…c228c438b95e4376ce0598c261f79ca	js	423 B	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/themes/g…c228c438b95e4376ce0598c261f79ca	js	429 B	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/themes/g…c228c438b95e4376ce0598c261f79ca	js	113 B	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/uploads/…2e4b4d4ecf2240ab90deaf3c53ca88f	js	38.2 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…/js/offside.min.js?ver=2.5.6	js	6.6 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…/js/sticky.min.js?ver=2.5.6	js	8.3 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…c228c438b95e4376ce0598c261f79ca	js	25.7 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-content/plugins/…c228c438b95e4376ce0598c261f79ca	js	3.5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-includes/js/jque…jquery-migrate.min.js?ver=3.4.1	js	13.3 KB	2026-10-09	2026-10-09
https://creativeplanning.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.1	js library	85.5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/2854.329dfa68ec55f814.js	js	6.4 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/8670.67bdbdfa5e66409c.js	js	2.1 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/2626.ae95ceaf9a14e764.js	js	14.4 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/596.df8104e61e5a6cf4.js	js	3.9 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/webpack-a0755b98e6d169a0.js	js	7.5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/polyfills-42372ed130431b0a.js	js	110 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks…lobal-error-bcd3a285b350cfd2.js	js	2.6 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks…/not-found-af197b193396e945.js	js	190 B	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/5750-61186c0c14f00c11.js	js	8.5 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/main-app-f373b540f7571d8c.js	js	483 B	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/3258-8abc1482d75a887d.js	js	235.4 KB	2026-10-09	2026-10-09
https://creativeplanning.com/_next/static/chunks/a3714740-2173e07da93301f1.js	js	196.3 KB	2026-10-09	2026-10-09
https://creativeplanning.com/family-office/	html	451 KB	2026-10-09	2026-10-09
https://creativeplanning.com/contact-us/	html	358.2 KB	2026-10-09	2026-10-09
https://creativeplanning.com/about/	html	366.6 KB	2026-10-09	2026-10-09
https://creativeplanning.com/	html	903.3 KB	2026-10-09	2026-10-09
https://creativeplanning.com/client-login/	html	330.3 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, 120 files, 6 MB; 44 libraries, 1 identifier, 35 third-party hosts
44 libraries added
- @vitest/utils 5.0.2
- gtm
- recaptcha
- @inkeep/agents-ui-js-cloud 0.17.8
- @clerk/ui 1.34.0
- @ant-design/x 2.9.0
- @joyfill/components 4.0.0-rc26
- @moveo-ai/web-client 0.117.0
- jspdf 4.2.1
- @reachfive/identity-core 1.42.0
- @reachfive/identity-ui 2.1.0
- ovenplayer 0.10.54
- and 32 more
1 identifier added
- GTM-MVT67QC Google Tag Manager container
37 third-party hosts added
- use.typekit.net
- cdn.userway.org
- maps.googleapis.com
- assets.calendly.com
- www.googletagmanager.com
- www.google.com
- react.dev
- www.w3.org
- github.com
- google.com
- server.fillout.com
- player.vimeo.com
- and 25 more
120 files added

Questions about creativeplanning.com

How does PageSourceSearch know what creativeplanning.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 creativeplanning.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 creativeplanning.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 creativeplanning.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.