What powers 551.com.tw?
Last seen Aug 2026 · 23 technologies across 14 categories
CDN
Font scripts
JavaScript frameworks
JavaScript libraries
Axios
since Dec 2025
scrollreveal
since Aug 2023
Live chat
Tawk.to
since Aug 2022
Message boards
phpBB
since May 2024
Miscellaneous
PWA
since Dec 2025
Operating systems
Ubuntu
since Aug 2022
Programming languages
PHP
since Jul 2020
Security
HSTS
since Aug 2023
UI frameworks
Web frameworks
Web servers
Webmail
Google Workspace
since Aug 2022
AI Crawlers
Doesn't mention any of the 33 AI crawlers we track in its robots.txt; all are allowed by default. Checked Sep 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Audience
Taiwan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
3.41 / 10 · ranked #998,547 of all domains
79 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.9 s |
| INP | 100 ms |
| CLS | 0 |
| TTFB | 500 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Chinese (Taiwan)
- Weight: 0.4 MB · 17 requests
Homepage as crawled by the HTTP Archive, Sep 2026.
Subdomains
| Host | Techs |
|---|---|
| invweb.551.com.tw | 13 |
| dt.551.com.tw | 11 |
| sinv.551.com.tw | 8 |
| www.551.com.tw | 8 |
| bug.551.com.tw | 7 |
| hope.551.com.tw | 7 |
| einv.551.com.tw | 1 |