What powers 
arch.cz?
Last seen Oct 2026 · 6 technologies across 6 categories
Analytics
Google Analytics
since Jan 2019
Authentication
Google Sign-in
since Feb 2021
Operating systems
Windows Server
since Jan 2019
Programming languages
PHP
since Aug 2021
Web frameworks
Microsoft ASP.NET
since Jan 2019
Web servers
AI Crawlers
Doesn't mention any of the 33 AI crawlers we track in its robots.txt; all are allowed by default. Checked Nov 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Audience
- 59% desktop
- 41% phone
Czechia
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.70 / 10 · ranked #316,106 of all domains
115 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.7 s |
| CLS | 0 |
| TTFB | 500 ms |
Real user p75, Chrome UX Report, Oct 2026.
Page
- Language: Czech (Czechia)
- Weight: 0.4 MB · 32 requests
Homepage as crawled by the HTTP Archive, Oct 2026.
Infrastructure
- Registered Aug 1998 (28 years) via INTERNET CZ, a.s., renews Oct 2028
- Hosted on INTERNET-CZ INTERNET CZ, a.s. (81.2.195.116)
- DNS: grdns.cz
- Email: forpsi.com
- Email security: SPF (soft fail), no DMARC record, DNSSEC signed, MTA-STS, BIMI
- Common Crawl link graph: rank 794,312, 2 hosts
DNS records as swept Nov 2026, registration from the registry's RDAP service. How the web is hosted