What powers 
c21.hk?
Last seen Sep 2026 · 52 technologies across 24 categories
Advertising
Taboola
since Aug 2025
Analytics
Authentication
Facebook Login
since Jul 2021
CDN
cdnjs
since Oct 2021
Cloudflare
since May 2022
Google Hosted Libraries
since Feb 2022
jQuery CDN
since Feb 2022
jsDelivr
since Jul 2020
CMS
Cookie compliance
Databases
MySQL
since Feb 2024
Font scripts
JavaScript frameworks
JavaScript graphics
JavaScript libraries
Live chat
WhatsApp Business Chat
since May 2022
Miscellaneous
Open Graph
since Feb 2024
RSS
since Feb 2024
Operating systems
Windows Server
since Apr 2020
Performance
Priority Hints
since Feb 2024
Programming languages
Security
Tag managers
Google Tag Manager
since Apr 2020
UI frameworks
Web frameworks
Web servers
Widgets
WordPress plugins
AMP for WordPress
since Feb 2024
WPForms
since Mar 2026
WordPress themes
AI Crawlers
No robots.txt, so all AI crawlers are allowed by default. Checked Oct 2026.
- robots.txt not found
- llms.txt not found
- ai.txt not found
- Sep 2026 * removed from robots.txt
- Aug 2026 robots.txt removed
- Aug 2026 robots.txt appeared
- Aug 2026 * added to robots.txt
AI Crawlers
No robots.txt, all AI crawlers allowed
Audience
- 68% phone
- 29% desktop
- 2% tablet
Hong Kong SAR China
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.53 / 10 · ranked #397,902 of all domains
168 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.6 s |
| INP | 100 ms |
| CLS | 0 |
| TTFB | 800 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Weight: 14.3 MB · 204 requests
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- Hosted on HKBNESL-AS-AP HKBN Enterprise Solutions Limited (58.64.216.18)
- DNS: pointdnshere.com
- Email: c21.hk
- Email security: no SPF record, no DMARC record
- SSL: Let's Encrypt, RSA 3072, expires Nov 2026
- Common Crawl link graph: rank 120,376, 7 hosts
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| c21.hk | 27 |
| www.c21.hk | 27 |
| bestbuy.c21.hk | 20 |
| hos.c21.hk | 15 |
| 360.c21.hk | 8 |
| aerial360.c21.hk | 6 |