cse.cz

.cz crawl

First seen 2026-05-16 · Last seen 2026-05-20 · ok HTTP/1.1 200 2072 ms crawled 2026-05-20

CZ · 81.91.86.10 · AS39790 Web4U s.r.o.

Reputation 87/100 weak security headers no dmarc policy

Classifying

HTML metadata

Title: Aktuality | ČSE
Language: cs

Technology

Server: openresty
CMS: Gatsby
PHP: 7.2.34 end of life

Analytics

Google Tag Manager

Third-party hosts loaded (5)

i.creativecommons.org×1
webarchiv.cz×1
www.google.com×1
www.googletagmanager.com×1
www.termsfeed.com×1

Social

Registration

Registrar

REG-WEB4U

Created

2000-02-05

Expires

2030-02-07 1358 days left

Updated

2012-04-04

Name servers

ns2.web4u.cz
ns.web4u.cz

DNS records live

NS

ns.web4u.cz
ns2.web4u.cz

MX

10 mx1.mailchannels.net
10 mx2.mailchannels.net

Verified for

Microsoft 365

Email authentication weak

SPF: v=spf1 include:_spf.web4u.cz ~all
softfail (~all)
DMARC: not published
DKIM: no key found at common selectors

Certificate (current)

R13

from 2026-03-18 to 2026-06-16

Expires in 26 days

Full certificate history on crt.sh ↗

HTTP security headers

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

findings

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

Links to (5)

Linked from (1)

ucitelskenoviny.cz×1