indexo.dev

matematik.cz

.cz crawl

First seen 2026-06-01 · Last seen 2026-06-02 · ok HTTP/1.1 200 336 ms crawled 2026-06-02

DE · 157.90.78.181 · AS24940 Hetzner Online GmbH

Reputation 95/100 weak security headers

Classifying

HTML metadata

Title
Matematik - Procvičování matematiky online
Language
cs

Technology

Server
Apache
jQuery
3.7.1
Stack
Django
Analytics
  • Google Tag Manager
Fonts
  • Google Fonts

Third-party hosts loaded (5)

  • cdn.jsdelivr.net×2
  • code.jquery.com×1
  • fonts.googleapis.com×1
  • www.googletagmanager.com×1
  • www.termsfeed.com×1

Contact

Phone

Registration

Registrar
REG-INTERNET-CZ
Created
2017-06-25
Expires
2027-06-24 385 days left
Updated
2020-04-29
Name servers
  • ns1.relaxhosting.cz
  • ns2.relaxhosting.cz

DNS records live

NS
  • ns1.relaxhosting.cz
  • ns2.relaxhosting.cz
MX
  • 10 mail1.relaxhosting.cz

Email authentication strong

SPF
v=spf1 mx a include:_netblocks.relaxhosting.cz include:spf.smartemailing.cz ~all
softfail (~all)
DMARC
v=DMARC1; p=quarantine; pct=100; rua=mailto:dmarc@relaxhosting.cz
policy: quarantine
DKIM
no key found at common selectors

Certificate (current)

R13
from 2026-04-16 to 2026-07-15
Expires in 41 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://matematik.cz/

findings
  • missing HSTS
  • missing Content Security Policy
  • missing frame protection
  • missing content type protection
  • missing Referrer Policy
  • missing Permissions Policy

Links to (2)

Linked from (2)