What powers 
clockss.org?
Last seen Sep 2026 · 27 technologies across 20 categories
Analytics
CMS
Databases
Font scripts
Hosting panels
JavaScript libraries
Marketing automation
Miscellaneous
Operating systems
Performance
Programming languages
Security
SEO
Tag managers
Web server extensions
Web servers
Webmail
Wikis
WordPress plugins
WordPress themes
AI Crawlers
Doesn't mention any of the 33 AI crawlers we track in its robots.txt; all are allowed by default. Checked Oct 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
- Oct 2026 * removed from robots.txt
- Sep 2026 * added to robots.txt
- Sep 2026 * removed from robots.txt
Top search keywords
| Keyword | Position | Est. monthly visits |
|---|---|---|
| california registry of charitable trusts | #2 | 230 |
| california nonprofit search | #4 | 86 |
| wiley wiley | #41 | 70 |
| california attorney general charity search | #2 | 63 |
| clocks | #50 | 63 |
| california charity lookup | #3 | 57 |
| california nonprofit lookup | #4 | 43 |
| california charity registration search | #2 | 42 |
| ca non profit registry | #2 | 42 |
| heterocycle | #4 | 32 |
| 501c3 lookup | #83 | 31 |
| ca charity search | #2 | 23 |
| california nonprofit registration | #4 | 21 |
| not for profit lookup | #35 | 17 |
| california charities | #3 | 16 |
| lockss | #3 | 14 |
| non profit organization search | #62 | 13 |
| ca nonprofit search | #4 | 9 |
| tax exempt organization search | #60 | 9 |
| state of california nonprofit search | #4 | 9 |
| california registry of charities and fundraisers | #2 | 8 |
| ca non profit search | #5 | 8 |
| california attorney general nonprofit search | #2 | 8 |
| 501c3 search california | #5 | 8 |
| 501c3 california lookup | #5 | 8 |
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
- 82% desktop
- 18% phone
United States
India
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
7.35 / 10 · ranked #26,144 of all domains
742 referring domains · OpenPageRank
Search traffic
1,000 est. monthly organic visits (US)
192 keywords in Google's top 30
Core Web Vitals
| LCP | 2.4 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 1500 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: English (United States)
- Weight: 1.4 MB · 52 requests
- WordPress theme: astra (child: clockss-astra) · all themes
- Structured data: JSON-LD, Microdata, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- CLOCKSS
- Country: United States
From the homepage's own structured data (Sep 2026) and Wikidata (CC0).
Infrastructure
- Registered Jan 2006 (20 years) via CSL Computer Service Langenbach GmbH d/b/a joker.com, renews Jan 2027
- Hosted on Amazon Web Services (44.199.152.91)
- Email: no MX record returned
- SSL: Let's Encrypt, RSA 4096, expires Nov 2026
- Common Crawl link graph: rank 22,763, 16 hosts
DNS records as swept Sep 2026, certificate as seen Sep 2026, registration from the registry's RDAP service. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| clockss.org | 20 |
| documents.clockss.org | 9 |
| triggered.stanford.clockss.org | 5 |
| triggered.clockss.org | 4 |
| triggered.edina.clockss.org | 4 |
| triggered.edinburgh.clockss.org | 4 |
| wayback.clockss.org | 3 |
Full technology history →
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Recent changes
- detected Google Tag Manager Jul 2026
- detected Twitter Emoji (Twemoji) Apr 2026