What powers 
ef.com.cn?
Last seen Aug 2026 · 65 technologies across 26 categories
A/B Testing
Advertising
Analytics
Blogs
CDN
CMS
CRM
Databases
JavaScript Frameworks
JavaScript Libraries
Marketing automation
Miscellaneous
Mobile frameworks
Operating Systems
PaaS
Programming Languages
Reviews
Security
SEO
Tag Managers
UI frameworks
Video Players
Web Frameworks
Web Servers
Webmail
Widgets
AI Crawlers
Doesn't name any of the 33 AI crawlers we track in its robots.txt. Catch-all rules (User-agent: *) restrict some paths for every crawler, AI or not. Checked Sep 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
Top search keywords
| Keyword | Position | Est. monthly visits |
|---|---|---|
| define bbs | #73 | 6 |
| don't feel like doing anything song | #56 | 3 |
| bbs meaning in chat | #56 | 1 |
| i guess so meaning | #68 | 1 |
| while when | #46 | 0 |
| will/shall contractions | #86 | 0 |
| yesterday once more lyrics in english | #33 | 0 |
| yingfu | #69 | 0 |
| what are definite and indefinite articles | #80 | 0 |
| intonation question tags | #78 | 0 |
| is an a definite article | #70 | 0 |
| grammar questions tag | #80 | 0 |
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
- 100% desktop
United States
China
Hong Kong SAR China
Malaysia
Japan
Singapore
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
5.05 / 10 · ranked #241,440 of all domains
102 referring domains · OpenPageRank
Search traffic
11 est. monthly organic visits (US)
12 keywords in Google's top 30
Core Web Vitals
| LCP | 2.4 s |
| INP | 75 ms |
| CLS | 0.1 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Chinese
- CDN: Cloudflare
- Weight: 3.4 MB · 105 requests
- Structured data: Microdata, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- Hosted on China Unicom (116.162.25.52)
- DNS: cf-ns.net
- Email: no MX record returned
- SSL: Google Trust Services, ECDSA P256, wildcard, expires Nov 2026
- Common Crawl link graph: rank 1,941,126, 13 hosts
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| www.ef.com.cn | 21 |
| baike.ef.com.cn | 19 |
| liuxue.ef.com.cn | 17 |
| center.ef.com.cn | 15 |
| corporatelearning.ef.com.cn | 15 |
| englishlive.ef.com.cn | 13 |
| m.ef.com.cn | 13 |
| careers.ef.com.cn | 12 |
| help.ef.com.cn | 4 |
Full technology history →
Report an incorrect detection
Recent changes
- detected Microsoft Clarity Jul 2026
- detected Cloudflare Bot Management Oct 2025