What powers concert.co.jp?
Last seen Oct 2026 · 11 technologies across 11 categories
Advertising
Twitter Ads
since Jul 2021
Analytics
Google Analytics
since Jan 2019
Authentication
Facebook Login
since Jul 2021
CDN
Cloudflare
since Mar 2025
Hosting
Sakura Internet
since Dec 2023
JavaScript libraries
Operating systems
CentOS
since Jan 2019
Programming languages
Security
Cloudflare Bot Management
since Mar 2025
Web servers
Widgets
Twitter
since Sep 2019
AI Crawlers
No robots.txt, so all AI crawlers are allowed by default. Checked Nov 2026.
- robots.txt not found
- llms.txt not found
- ai.txt not found
AI Crawlers
No robots.txt, all AI crawlers allowed
Audience
- 77% phone
- 23% desktop
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.55 / 10 · ranked #394,683 of all domains
65 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.5 s |
| INP | 275 ms |
| CLS | 0 |
| TTFB | 400 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: Japanese
- Weight: 1.1 MB · 61 requests
Homepage as crawled by the HTTP Archive, Oct 2026.
Organisation
- Trouvère Quartet
- Founded: 1987
From Wikidata (CC0).
Infrastructure
- Hosted on Sakura Internet (49.212.51.91)
- DNS: Sakura Internet
- Email: Sakura Internet
- Email security: no SPF record, no DMARC record
- Common Crawl link graph: rank 3,003,010, 4 hosts
DNS records as swept Nov 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| www.concert.co.jp | 11 |
| service.concert.co.jp | 4 |
Full technology history →
Report an incorrect detection
Recent changes
- detected Cloudflare May 2026
- detected Cloudflare Bot Management May 2026