indexo.dev

optonet.cz

.cz dns crawl

First seen 2026-05-28 · Last seen 2026-05-31 · ok HTTP/1.1 200 264 ms crawled 2026-05-31

CZ · 78.156.158.111 · AS43542 OptoNet Communication, spol. s.r.o.

Reputation 92/100 no dmarc policy

Classifying

HTML metadata

Title
Úvod | OptoNet Communication, spol. s r.o.
Description
Společnost Optonet působí na poli internetových, serverových, cloudových technologií. Poskytuje pronájem virtuálních i fyzických serverů.

Technology

CMS
Joomla
jQuery
3.2.1 known XSS (<3.5)
Stack
PHP
Fonts
  • Google Fonts

Third-party hosts loaded (3)

  • fonts.googleapis.com×2
  • cdnjs.cloudflare.com×1
  • unpkg.com×1

Social

Contact

Email
Phone

Registration

Registrar
REG-ACTIVE24
Created
2005-09-29
Expires
2026-09-28 119 days left
Updated
2025-05-27
Name servers
  • ns1.websupport.cz
  • ns2.websupport.cz
  • ns3.websupport.eu

DNS records live

NS
  • ns1.websupport.cz
  • ns2.websupport.cz
  • ns3.websupport.eu
MX
  • 100 optonet-cz.mail.protection.outlook.com
TXT
  • MS=18A18E25DE1978702C3AFEA8D28F3B09562F5CB1
Verified for
  • Google
  • Microsoft 365

Email authentication weak

SPF
v=spf1 include:spf.protection.outlook.com a:mx2.optonet.cz -all
strict (-all)
DMARC
not published
DKIM
no key found at common selectors

Certificate (current)

YR2
from 2026-05-29 to 2026-08-27
Expires in 87 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 60/100 Checked live page: https://optonet.cz/

present
  • content-security-policy
  • x-content-type-options
findings
  • missing HSTS
  • missing frame protection
  • missing Referrer Policy
  • missing Permissions Policy
Header values
x-content-type-options
nosniff
content-security-policy
frame-ancestors 'self'

Links to (5)

Linked from (1)