caltech.edu

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caltech.edu is ranked #3,215 in the Tranco list of the world's most popular websites (list of Oct 13, 2026), up 35 places in four weeks. Its homepage uses jQuery, Cloudflare Web Analytics and Google Tag Manager. It is served through cdnjs and Cloudflare.

Global rank

#3,215

▲ 26 this week

Domain age

—

Registration date unavailable

Technologies

detected on the homepage

SEO score

93/100

homepage checks

Popularity rank

#3,215 of the top 1 million sites in the Tranco research ranking, which averages several traffic and DNS sources over 30 days. Best rank in the period shown: #3,195.

Weekly Tranco rank (lower is more popular).

See where caltech.edu sits in the top 10,000

Domain registration

The registry for .edu does not publish registration data over RDAP.

Technology stack

JavaScript libraries

jQuery 3.3.1

Analytics

Cloudflare Web Analytics Google Tag Manager

CDN

cdnjs Cloudflare

Detected from the homepage HTML and response headers on Oct 14, 2026. Tools loaded only after scripts run (or after consent banners) may be missing.

Homepage SEO check

Checked from the HTML our scanner received on Oct 14, 2026. Content added later by JavaScript isn't counted.

93/100

https://www.caltech.edu/

Home - www.caltech.edu

The California Institute of Technology aims to expand human knowledge and benefit society through research integrated with education.

20 passed · 3 warnings · 0 failed

Content

✓Title22 characters
✓Meta description133 characters
✓H1 headingExactly one H1
✓Subheadings7 H2 headings
!Image alt text1 of 120 images have no alt text
✓Content lengthAbout 1,657 words

Indexing

✓IndexableNo noindex directive
✓Canonical URLhttps://www.caltech.edu/
✓robots.txtFound
✓XML sitemapFound
✓Language attributeen
!Structured dataNo JSON-LD or microdata

Social sharing

✓Open GraphTitle, description and image set
✓Twitter / X cardsummary

Technical

✓HTTPSServed over HTTPS
✓Mobile viewportFound
✓FaviconFound
✓Character encodingutf-8

Security headers

!Strict-Transport-SecurityNot set
✓Content-Security-PolicySet
✓Clickjacking protectionSet
✓X-Content-Type-OptionsSet
✓Referrer-PolicySet

Server response

Final URL: https://www.caltech.edu/
HTTP status: 200
Server: cloudflare
Response time: 1.05 s (first byte 962 ms, from our scanner in a US data centre)
HTML size: 345 KB
Compression: gzip

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#5,169	kotaku.com	WordPress, cdnjs, Cloudflare
#8,274	showroomprive.com	cdnjs, Cloudflare, jsDelivr
#9,224	themoscowtimes.com	cdnjs, Cloudflare, jQuery

Sites ranked near caltech.edu

Rank	Website	Registered	Built with
#3,210	mcgill.ca	2000	—
#3,211	nextdns.io	2019	Next.js, React, Vercel
#3,212	qh-cdn.com	2018	—
#3,213	walgreens.com	1995	React, Akamai, Google Fonts
#3,214	cygwin.com	1999	Nginx
#3,216	wikibooks.org	2003	—
#3,217	chase.com	1995	Next.js, React, Akamai
#3,218	manutouch.com.cn	—	—
#3,219	metro.co.uk	1995	WordPress, Nginx, Google Analytics
#3,220	tvinteractive.tv	2009	—

Questions about caltech.edu

How popular is caltech.edu?

caltech.edu is #3,215 worldwide in the Tranco list published Oct 13, 2026.

What is caltech.edu built with?

We detected jQuery, Cloudflare Web Analytics, Google Tag Manager, cdnjs and Cloudflare on its homepage.