indexo.dev

book4u.cz

.cz crawl

First seen 2026-05-31 · Last seen 2026-06-02 · ok HTTP/1.1 200 489 ms crawled 2026-06-01

CZ · 193.107.160.28 · AS47232 ISP Alliance a.s.

Reputation 87/100 weak security headers no dmarc policy

Classifying

HTML metadata

Title
Book4u rezervační systém
Description
Rezervační systém určený pro rezervování místností, učeben sportovišť, k lékaři, svatebních termínů, sedadel v kinech a divadlech.
Language
cs-CZ

Technology

Server
Apache
PHP
5.6.40 end of life
Analytics
  • Google Tag Manager

Third-party hosts loaded (1)

  • www.googletagmanager.com×1

Contact

Phone

Registration

Registrar
REG-INTERNET-CZ
Created
2009-10-29
Expires
2026-10-28 145 days left
Updated
2015-01-06
Name servers
  • ns3.hosting4everyone.eu
  • ns.cabernet.cz

DNS records live

NS
  • ns.cabernet.cz
  • ns3.hosting4everyone.eu
MX
  • 10 server.cabernet.cz
TXT
  • v=DMARC1; p=none; rua=mailto:servis@cabernet.cz; ruf=mailto:servis@cabernet.cz

Email authentication weak

SPF
v=spf1 mx a ip4:193.107.160.28 -all
strict (-all)
DMARC
not published
DKIM
  • default: v=DKIM1; t=s; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDKF48LeuLrUZYJmM4XEmylY3AiA7JZINABCAcyFGrQfq34zAUUgeBkP4yl+/y7yG0pmzZcsnC0jQ//+68if+cE…
selectors probed

Certificate (current)

R13
from 2026-05-25 to 2026-08-23
Expires in 79 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://www.book4u.cz/

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

Links to (4)

Linked from (4)