What powers kernel.org?
Last seen Aug 2026 · 44 technologies across 20 categories
Caching
CDN
CRM
Documentation
Font scripts
Issue trackers
JavaScript frameworks
JavaScript libraries
Miscellaneous
Operating systems
PaaS
Payment processors
Performance
Programming languages
Security
Static site generator
UI frameworks
Web servers
Webmail
Wikis
AI Crawlers
Blocks all crawlers by default in robots.txt (User-agent: *). Checked Sep 2026.
Training crawlers
- AI2Bot Blocked
- Applebot-Extended Blocked
- Bytespider Blocked
- ClaudeBot Blocked
- cohere-training-data-crawler Blocked
- Diffbot Blocked
- FacebookBot Blocked
- Google-CloudVertexBot Blocked
- Google-Extended Blocked
- GoogleOther Blocked
- GPTBot Blocked
- ImagesiftBot Blocked
- img2dataset Blocked
- meta-externalagent Blocked
- PanguBot Blocked
- SBIntuitionsBot Blocked
- Webzio-Extended Blocked
Search and AI assistants
- Amazonbot Blocked
- Applebot Blocked
- Claude-SearchBot Blocked
- DuckAssistBot Blocked
- OAI-SearchBot Blocked
- PerplexityBot Blocked
- PetalBot Blocked
- YouBot Blocked
User-request fetchers
- ChatGPT-User Blocked
- Claude-User Blocked
- GoogleAgent-Mariner Blocked
- meta-externalfetcher Blocked
- MistralAI-User Blocked
- Perplexity-User Blocked
The other 2 AI crawlers we track are not mentioned and are blocked by the catch-all rule (User-agent: *).
- robots.txt found
- llms.txt not found
- ai.txt not found
- Sep 2026 claude-searchbot added to robots.txt
- Sep 2026 claude-user added to robots.txt
- Sep 2026 claude-web added to robots.txt
- Sep 2026 claudebot added to robots.txt
- Sep 2026 oai-searchbot added to robots.txt
- Sep 2026 cohere-ai added to robots.txt
Top search keywords
| Keyword | Position | Est. monthly visits |
|---|---|---|
| linux | #6 | 10,200 |
| vfs file system | #2 | 5,400 |
| virtual file system | #3 | 3,200 |
| linux kernel | #2 | 1,100 |
| numa | #6 | 410 |
| rcu | #11 | 340 |
| git pull | #6 | 220 |
| latest linux kernel | #1 | 180 |
| archive site | #60 | 160 |
| relea | #64 | 160 |
| git checkout | #8 | 120 |
| pagemap | #1 | 120 |
| centos | #76 | 100 |
| gnu | #67 | 100 |
| linux kernel download | #1 | 97 |
| download linux kernel | #1 | 97 |
| yuv | #3 | 86 |
| linux swapping | #1 | 79 |
| kernel-based virtual machine | #16 | 78 |
| ftrace | #1 | 73 |
| ftrace | #1 | 73 |
| sparse | #74 | 70 |
| linux source code | #3 | 70 |
| non uniform memory access | #14 | 68 |
| linux kernel development | #2 | 63 |
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
All crawlers blocked
Audience
- 68% desktop
- 32% phone
United States
India
United Kingdom
China
Poland
Switzerland
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
8.73 / 10 · ranked #993 of all domains
8,985 referring domains · OpenPageRank
Search traffic
29,000 est. monthly organic visits (US)
6,432 keywords in Google's top 30
Core Web Vitals
| LCP | 0.5 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 400 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: English
- Weight: 0.1 MB · 15 requests
Homepage as crawled by the HTTP Archive, Aug 2026.
Subdomains
| Host | Techs |
|---|---|
| dracut.wiki.kernel.org | 20 |
| b4.docs.kernel.org | 12 |
| erofs.docs.kernel.org | 11 |
| hwmon.wiki.kernel.org | 10 |
| iwd.wiki.kernel.org | 10 |
| wireless.wiki.kernel.org | 10 |
| wireless.docs.kernel.org | 9 |
| backports.docs.kernel.org | 8 |
| docs.kernel.org | 8 |
| korg.docs.kernel.org | 8 |
| ata.wiki.kernel.org | 7 |
| btrfs.wiki.kernel.org | 7 |
| bugzilla.kernel.org | 6 |
| social.kernel.org | 6 |
| backports.wiki.kernel.org | 5 |
| cdn.kernel.org | 5 |
| ext4.wiki.kernel.org | 5 |
| git.wiki.kernel.org | 5 |
| i2c.wiki.kernel.org | 5 |
| perf.wiki.kernel.org | 5 |
| raid.wiki.kernel.org | 5 |
| rt.wiki.kernel.org | 5 |
| subspace.kernel.org | 5 |
| www.kernel.org | 5 |