indexo.dev

redmonster.cz

.cz crawl

First seen 2026-05-27 · Last seen 2026-05-31 · ok HTTP/1.1 200 506 ms crawled 2026-05-30

NL · 51.124.137.235 · AS8075 Microsoft Corporation

Reputation 100/100

Classifying

HTML metadata

Title
Red Monster | Online vzdělávací materiály pro děti - Red Monster
Language
cs
Canonical
https://redmonster.cz/

Open Graph

url
https://uuapp.plus4u.net/uu-webkit-maing02/99923616732505139-ae139a277b634d6b9fe8c7ce5ddfe762/
title
Red Monster
site name
Red Monster
description
Red Monster jsou moderní online materiály pro základní a střední školy. Učení probíhá interaktivní formou. Vhodné pro žáky ZŠ a studenty SŠ.

Technology

Server
Apache

Third-party hosts loaded (2)

  • uuapp.plus4u.net×18
  • cdn.plus4u.net×2

DNS records live

NS
  • ns1.websupport.cz
  • ns2.websupport.cz
  • ns3.websupport.eu
MX
  • 10 mxgw.plus4u.net
TXT
Show 6 TXT records
  • fy82gt4h2x4q3vwlnxf5sb51z9wnfn4s
  • nwdf6png4pldyll0hx3tgvtgpkm7kcbk
  • _gw654iilaj4q0ev8953rw9bm5bb041t
  • _izssho988uwj6fj5yvwmeiw423tsoxl
  • _rbar5vxjxnah33p21h3oendlwx7bdjw
  • _zf3ui12rlafceivz9jhdnf9bzdm03ig

Email authentication strong

SPF
v=spf1 a mx a:smtp.plus4u.net include:spf.smartemailing.cz ~all
softfail (~all)
DMARC
v=DMARC1; p=quarantine; rua=mailto:dmarc+606908@smartemailing.cz,mailto:dmarc@plus4u.net; fo=1
policy: quarantine
DKIM
no key found at common selectors

Certificate (current)

RapidSSL TLS RSA CA G1
from 2025-07-28 to 2026-08-20
Expires in 80 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 100/100 Checked live page: https://redmonster.cz/

present
  • strict-transport-security
  • content-security-policy
  • x-frame-options
  • x-content-type-options
  • referrer-policy
  • permissions-policy
Header values
referrer-policy
strict-origin-when-cross-origin
x-frame-options
DENY
permissions-policy
camera=self, encrypted-media=self, execution-while-not-rendered=self, execution-while-out-of-viewport=self, geolocation=self, layout-animations=self, legacy-image-formats=self, microphone=self, navigation-override=self, payment=self, picture-in-picture=self, speaker-selection=self, sync-xhr=self, usb=self, fullscreen=(self "https://www.youtube.com" "https://player.vimeo.com" "https://www.youtube-nocookie.com")
x-content-type-options
nosniff
content-security-policy
frame-ancestors 'self'
strict-transport-security
max-age=31536000; includeSubDomains

Linked from (3)