What powers emailprofi.cz?
Last seen Oct 2026 · 6 technologies across 5 categories
JavaScript libraries
Miscellaneous
Open Graph
since Sep 2022
PWA
since Aug 2022
Reverse proxies
Envoy
since Oct 2019
Security
HSTS
since Apr 2023
Tag managers
Google Tag Manager
since Jan 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
- 79% phone
- 17% desktop
- 4% tablet
Czechia
Germany
Slovakia
Croatia
Greece
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
3.21 / 10 · ranked #1,251,055 of all domains
20 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.8 s |
| INP | 50 ms |
| CLS | 0 |
| TTFB | 200 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Weight: 0.9 MB · 40 requests
- Structured data: Microdata, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Oct 2026.
Infrastructure
- Hosted on SEZNAM-CZ Seznam.cz, a.s. (77.75.78.197, IPv6)
- DNS: Seznam Email
- Email: Seznam Email
- Email security: SPF (hard fail), DMARC quarantine, DNSSEC signed, CAA
- SSL: Let's Encrypt, RSA 4096, wildcard, expires Dec 2026
- Common Crawl link graph: rank 8,789,780, 2 hosts
DNS records as swept Nov 2026, certificate as seen Nov 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| emailprofi.cz | 6 |
| www.emailprofi.cz | 6 |