indexo.dev

flexibooks.cz

.cz crawl

First seen 2026-05-21 · Last seen 2026-05-30 · ok HTTP/1.1 200 310 ms crawled 2026-05-27

CZ · 46.243.49.9 · AS43541 VSHosting s.r.o.

Reputation 94/100 dmarc monitor-only

Classifying

HTML metadata

Title
Flexibooks • docela jiné e-knihy
Description
Flexibooks nabízí více než 6 000 titulů | naučná a odborná literatura | e-knihy a interaktivní učebnice
Language
cs

Technology

jQuery
1.10.2 known XSS (<3.5)
Stack
ASP.NET
Analytics
  • Google Tag Manager
Fonts
  • Google Fonts

Third-party hosts loaded (2)

  • fonts.googleapis.com×1
  • www.googletagmanager.com×1

Registration

Registrar
REG-INTERNET-CZ
Created
2012-06-13
Expires
2029-06-12 1107 days left
Updated
2018-05-18
Name servers
  • ns.forpsi.cz
  • ns.forpsi.it
  • ns.forpsi.net

DNS records live

NS
  • ns.forpsi.cz
  • ns.forpsi.it
  • ns.forpsi.net
MX
  • 0 flexibooks-cz.mail.protection.outlook.com
Verified for
  • Meta
  • Microsoft 365

Email authentication partial

SPF
v=spf1 a mx include:spf.protection.outlook.com ip4:31.30.32.226 include:spf.netdirect.cz ~all
softfail (~all)
DMARC
v=DMARC1; p=none
policy: none (monitoring only)
DKIM
  • mail: v=DKIM1; k=rsa; n=1024; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQD/MOGT1bi/xbn+aWd5Sufaf9pNhjgmZ/OXmKZt8Mu1wq3bMx5dbO5mzU15VfQPTGkMwFhGn4L+0J…
selectors probed

Certificate (current)

RapidSSL TLS RSA CA G1
from 2025-09-25 to 2026-10-27
Expires in 148 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 100/100 Checked live page: https://flexibooks.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
SAMEORIGIN
permissions-policy
accelerometer=(), camera=(), gyroscope=(), magnetometer=(), microphone=(), usb=()
x-content-type-options
nosniff
content-security-policy
upgrade-insecure-requests;
strict-transport-security
max-age=63072000; includeSubDomains

Links to (2)

Linked from (2)