What powers caltech.edu?
Last seen Aug 2026 · 291 technologies across 57 categories
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AI Crawlers
Doesn't mention any of the 33 AI crawlers we track in its robots.txt; all are allowed by default. Checked Sep 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
- Sep 2026 cohere-training-data-crawler removed from robots.txt
- Sep 2026 anthropic-ai removed from robots.txt
- Sep 2026 *: Allowed (was Restricted)
- Sep 2026 img2dataset removed from robots.txt
- Sep 2026 omgilibot removed from robots.txt
- Sep 2026 amazonbot removed from robots.txt
Top search keywords
| Keyword | Position | Est. monthly visits |
|---|---|---|
| caltech pasadena | #1 | 33,400 |
| caltech | #1 | 33,400 |
| cal institute of technology | #1 | 15,000 |
| california institute of technology | #1 | 15,000 |
| jpl labs | #3 | 2,200 |
| jpl lab | #3 | 2,200 |
| love | #73 | 1,900 |
| jet propulsion lab california | #4 | 1,500 |
| black hole | #13 | 1,500 |
| jpl california | #5 | 1,000 |
| cal | #26 | 950 |
| two black holes colliding | #1 | 880 |
| 2 black holes colliding | #1 | 880 |
| caltech admissions statistics | #5 | 850 |
| jpl | #7 | 690 |
| hindenburg | #10 | 680 |
| hindenburg explosion | #8 | 650 |
| duke university | #39 | 520 |
| caltech map | #1 | 490 |
| tech | #42 | 420 |
| cahill center for astronomy and astrophysics | #1 | 400 |
| california tech | #1 | 400 |
| black hole picture | #10 | 370 |
| jen-hsun huang | #31 | 280 |
| caltech address | #1 | 270 |
The site's top keywords in Google (US), with the visits each one is estimated to bring per month.
Top backlinks
Top links pointing at the site, one per source domain, strongest first. The anchor text opens the page carrying the link.
AI Crawlers
No AI crawlers blocked
Audience
- 60% desktop
- 38% phone
- 1% tablet
United States
Mexico
India
Germany
Philippines
United Kingdom
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
8.65 / 10 · ranked #1,352 of all domains
11,979 referring domains · OpenPageRank
Search traffic
148,700 est. monthly organic visits (US)
22,852 keywords in Google's top 30
Core Web Vitals
| LCP | 1.7 s |
| INP | 50 ms |
| CLS | 0 |
| TTFB | 800 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: English
- CDN: Cloudflare
- Weight: 1.2 MB · 35 requests
- Structured data: OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Sep 2026.
Similar sites
Closest technology stacks among the highest-authority sites we track; "shared" counts the distinctive technologies in common.
Organisation
- California Institute of Technology
- Founded: 1891
- Sector: higher education
- Country: United States
From Wikidata (CC0).
Infrastructure
- Hosted on Amazon Web Services (52.26.125.194)
- Email: no MX record returned
- Email security: DNSSEC signed
- SSL: Google Trust Services, ECDSA P256, expires Nov 2026
- Common Crawl link graph: rank 365, 2,539 hosts
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| bootcamp.ctme.caltech.edu | 35 |
| breakthrough.caltech.edu | 34 |
| maglab.caltech.edu | 32 |
| nanofab.caltech.edu | 32 |
| www.alumni.caltech.edu | 31 |
| ctme.caltech.edu | 28 |
| fhalab.caltech.edu | 28 |
| tpn.caltech.edu | 28 |
| pg-p.ctme.caltech.edu | 27 |
| alumni.caltech.edu | 25 |
| aphms.caltech.edu | 25 |
| eas.caltech.edu | 25 |
| jcpgroup.caltech.edu | 25 |
| jensenlab.caltech.edu | 25 |
| portal.alumni.caltech.edu | 25 |
| ee.caltech.edu | 24 |
| auditoriums.caltech.edu | 23 |
| cascic-apply.caltech.edu | 23 |
| go.ctme.caltech.edu | 23 |
| inqnet.caltech.edu | 23 |
| iqim.caltech.edu | 23 |
| store.palomar.caltech.edu | 23 |
| voorheeslab.caltech.edu | 23 |
| www.caltech.edu | 23 |
Full technology history →
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Recent changes
- dropped BugSnag Jul 2026
- detected Constant Contact Jul 2026
- dropped Ember.js Jun 2026
- dropped Apollo May 2026
- dropped Emotion May 2026
- dropped GraphQL May 2026
- dropped MUI May 2026
- dropped Photo Gallery May 2026
- dropped ThemeGrill Spacious May 2026
- detected Angular Apr 2026
- detected Zone.js Apr 2026
- dropped Autoptimize Mar 2026
- dropped Flickity Mar 2026
- dropped OceanWP Mar 2026
- dropped Google Sites Feb 2026
- dropped MonsterInsights Feb 2026
- detected decimal.js Jan 2026
- detected WhatsApp Business Chat Jan 2026
- detected Kadence WP Blocks Dec 2025
- detected Cloudflare Browser Insights Nov 2025
- dropped Salesloft Nov 2025
- detected math.js Oct 2025
- dropped Zoominfo Oct 2025