How does PageSourceSearch know what codeforces.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 codeforces.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 codeforces.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 codeforces.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

codeforces.com

Built with jquery 1.2, gtag, @wix/design-system 1.328.0, daterangepicker 3.1.0, moment 2.31.0, @cognigy/webchat 3.50.0, cloudflare-insights, @brainfish-ai/nudge-widget 0.1.3, @vitest/utils 5.0.2, ngmap 1.18.5, @kwaeri/user-experience 0.1.13, bulma-extensions 6.2.7 and more. 3 pages and 72 stored files.

rank 11,122 24 libraries 1 identifier 0 third-party hosts 0 crawls 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
jquery	1.2	2026-10-01
gtag		2026-10-01
@wix/design-system	1.328.0	2026-10-01
daterangepicker	3.1.0	2026-10-01
moment	2.31.0	2026-10-01
@cognigy/webchat	3.50.0	2026-10-01
cloudflare-insights		2026-10-01
@brainfish-ai/nudge-widget	0.1.3	2026-10-01
@vitest/utils	5.0.2	2026-10-01
ngmap	1.18.5	2026-10-01
@kwaeri/user-experience	0.1.13	2026-10-01
bulma-extensions	6.2.7	2026-10-01
jquery.scrollup	2.4.1	2026-10-01
sb-admin-2	3.3.8	2026-10-01
jquery.hotkeys	0.1.0	2026-10-01
@recogito/annotorious-openseadragon	2.7.19	2026-10-01
hexo-theme-redefine	2.9.0	2026-10-01
syzoj-public-cdn	1.2.0	2026-10-01
bxslider	4.2.17	2026-09-24
lightbox2	2.12.0	2026-09-24
mv-boost	0.0.8	2026-09-24
cloudflare-email-decode		2026-09-24
pushfeedback	0.1.85	2026-09-24
jquery-slim	3.0.0	2026-09-24

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
Universal Analytics property id (Google)	UA-743380-5	view source

Third-party hosts

The stored pages and scripts reference no host outside codeforces.com.

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 72) }. 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://codeforces.com/service-worker-17083.js	js	12.7 KB	2026-10-01	current
https://static.cloudflareinsights.com/beacon.min…85bb4c19e7a9bdbcba1788362987495	js library	not fetched	2026-10-01	current
https://www.googletagmanager.com/gtag/js?id=UA-743380-5	js library	not fetched	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/markitup/sets/markdown/set.js	js	5.4 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/markitup/jquery.markitup.js	js	17.9 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/purify.min.js	js	21.7 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/confetti.min.js	js	4.1 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/preparedVerdictFormats-en.js	js	103.6 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/EventCatcher.js?v=20160131	js	2.4 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/codeforces.js?v=20160131	js	73.1 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/sjcl.js	js	19.3 KB	2026-10-01	current
https://codeforces.com/scripts/a601c4fc88696097f…/en/codeforces-options.js	js	443 B	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/autosize.min.js	js library	3.5 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/clipboard.min.js	js	10.7 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/jquery.drafts.js	js	10.9 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/jquery.ba-bbq.js	js	4.7 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/jquery.colorbox-min.js	js	9.3 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/jquery.ie6blocker.js	js	860 B	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/jquery.datepick.js	js	99.4 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/jquery.autocomplete.js	js	21.8 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/controls/wysiwyg.link.js	js	6.6 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/controls/wysiwyg.image.js	js	9 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/controls/wysiwyg.table.js	js	3.9 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/controls/wysiwyg.colorpicker.js	js	6.5 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/jquery.wysiwyg.js	js	52.2 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/facebox.js	js	9 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/jquery.hotkeys.js	js	4.9 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/jquery.swipe.js	js	2.5 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/jquery.jgrowl.js	js	10.2 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/jquery.lavalamp.min.js	js	3 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/jquery.easing.min.js	js	9.6 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/pushstream.js	js	39.8 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/moment-with-locales.min.js	js	318.9 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/prettify/prettify.js	js	63.9 KB	2026-10-01	current
https://codeforces.com/codeforces.org/s/17083/js/jquery-1.8.3.js	js library	259.8 KB	2026-10-01	current
https://codeforces.com/mathjax.codeforces.org/Ma…?config=TeX-AMS_HTML-full	js	62 KB	2026-10-01	current
https://codeforces.com/cdn-cgi/content?id=YIJ00C…TfzVGmW0SUkbpERqbCLZydACqIHl.3k	html	3.2 KB	2026-10-01	current
https://codeforces.com/	html	178.2 KB	2026-10-01	current
https://codeforces.com/service-worker-19794.js	js	12.7 KB	2026-09-24	current
https://codeforces.com/cdn-cgi/scripts/5c5dd728/…/email-decode.min.js	js	1.2 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/markitup/sets/markdown/set.js	js	5.4 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/markitup/jquery.markitup.js	js	17.9 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/purify.min.js	js	21.7 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/confetti.min.js	js	4.1 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/preparedVerdictFormats-en.js	js	103.6 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/EventCatcher.js?v=20160131	js	2.4 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/codeforces.js?v=20160131	js	73.1 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/sjcl.js	js	19.3 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/autosize.min.js	js	3.5 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/clipboard.min.js	js	10.7 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/jquery.drafts.js	js	10.9 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/jquery.ba-bbq.js	js	4.7 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/jquery.colorbox-min.js	js	9.3 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/jquery.ie6blocker.js	js	860 B	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/jquery.datepick.js	js	99.4 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/jquery.autocomplete.js	js	21.8 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/controls/wysiwyg.link.js	js	6.6 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/controls/wysiwyg.image.js	js	9 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/controls/wysiwyg.table.js	js	3.9 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/controls/wysiwyg.colorpicker.js	js	6.5 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/jquery.wysiwyg.js	js	52.2 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/facebox.js	js	9 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/jquery.hotkeys.js	js	4.9 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/jquery.swipe.js	js	2.5 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/jquery.jgrowl.js	js	10.2 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/jquery.lavalamp.min.js	js	3 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/jquery.easing.min.js	js	9.6 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/moment-with-locales.min.js	js	318.9 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/pushstream.js	js	39.8 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/prettify/prettify.js	js	63.9 KB	2026-09-24	current
https://codeforces.com/codeforces.org/s/19794/js/jquery-1.8.3.js	js	259.8 KB	2026-09-24	current
https://codeforces.com/cdn-cgi/content?id=_PnAdU…ZapLbpAIJ4NImShIoGeImMJM9C0e9zl	html	3.5 KB	2026-09-24	current

Timeline

No crawl has recorded a snapshot of this site yet; snapshots are written by every crawl from now on.

Questions about codeforces.com

How does PageSourceSearch know what codeforces.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 codeforces.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 codeforces.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 codeforces.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.