What powers 21lectures.com?
Last seen Aug 2026 · 17 technologies across 11 categories
Analytics
CDN
Cookie compliance
Ecommerce
Font scripts
JavaScript frameworks
JavaScript libraries
Miscellaneous
Performance
Security
UI frameworks
AI Crawlers
Blocks 8 of 33 AI crawlers we track by name in its robots.txt. Checked Aug 2026.
Training crawlers
- Applebot-Extended Blocked
- Bytespider Blocked
- CCBot Blocked
- ClaudeBot Blocked
- Google-Extended Blocked
- GPTBot Blocked
- meta-externalagent Blocked
Search and AI assistants
- Amazonbot Blocked
The other 25 AI crawlers we track are not mentioned and stay allowed by default.
- robots.txt found
- llms.txt not checked
- ai.txt not checked
Content Signals:
search=yes ai-train=no declared in robots.txt
AI Crawlers
8 of 33 AI crawlers blocked
Standards: Content Signals
Audience
- 57% phone
- 43% desktop
Indonesia
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
1.34 / 10 · ranked #8,149,340 of all domains
11 referring domains · OpenPageRank
Search traffic
2 est. monthly organic visits (US)
2 keywords in Google's top 30
Core Web Vitals
| LCP | 2.5 s |
| INP | 175 ms |
| CLS | 0 |
| TTFB | 1000 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Indonesian
- CDN: Cloudflare
- Weight: 2.6 MB · 32 requests
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Aug 2026.
Subdomains
| Host | Techs |
|---|---|
| www.21lectures.com | 14 |
| 21lectures.com | 9 |
| bitcoin.21lectures.com | 6 |
Full technology history →
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Recent changes
- dropped core-js Aug 2026
- dropped Elementor Aug 2026
- dropped Google Analytics Aug 2026
- dropped Google Workspace Aug 2026
- dropped HSTS Aug 2026
- dropped HubSpot Aug 2026
- dropped HubSpot Analytics Aug 2026
- dropped HubSpot WordPress plugin Aug 2026
- dropped jQuery Aug 2026
- dropped jQuery Migrate Aug 2026
- dropped jQuery UI Aug 2026
- dropped MySQL Aug 2026
- dropped Nginx Aug 2026
- dropped PHP Aug 2026
- dropped RSS Aug 2026
- dropped Site Kit Aug 2026
- dropped Twitter Aug 2026
- dropped Twitter Ads Aug 2026
- dropped WordPress Aug 2026
- dropped WP Fastest Cache Aug 2026
- dropped WPML Aug 2026
- dropped Yoast SEO Aug 2026