indexo.dev

vzdelavani21.cz

.cz crawl

First seen 2026-05-16 · Last seen 2026-05-16 · ok HTTP/1.1 200 4312 ms crawled 2026-05-20

CZ · 195.113.89.35 · AS2852 CESNET z.s.p.o.

Reputation 87/100 weak security headers no dmarc policy

Classifying

HTML metadata

Title
Vzdělávání 21
Language
cs

Open Graph

url
https://vzdelavani21.cz/V21-1.html
title
Root
site name
Vzdělávání 21

Technology

Server
Apache
jQuery
3.7.1

Third-party hosts loaded (3)

  • cuni.cz×4
  • cdn.jsdelivr.net×1
  • www.google.com×1

Social

Registration

Registrar
REG-INTERNET-CZ
Created
2019-02-05
Expires
2027-02-04 259 days left
Updated
2023-01-06
Name servers
  • cuce.ruk.cuni.cz
  • david.ruk.cuni.cz
  • golias.ruk.cuni.cz

DNS records live

NS
  • cuce.ruk.cuni.cz
  • david.ruk.cuni.cz
  • golias.ruk.cuni.cz
MX
  • 20 cuce.ruk.cuni.cz

Email authentication weak

SPF
v=spf1 -all
strict (-all)
DMARC
not published
DKIM
no key found at common selectors

Certificate (current)

R13
from 2026-04-08 to 2026-07-07
Expires in 47 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 40/100 Checked live page: https://vzdelavani21.cz/V21-1.html

present
  • x-frame-options
findings
  • missing HSTS
  • missing Content Security Policy
  • missing content type protection
  • missing Referrer Policy
  • missing Permissions Policy
Header values
x-frame-options
DENY

Links to (6)

Linked from (1)