instav.cz

.cz crawl

First seen 2026-06-01 · Last seen 2026-06-02 · ok HTTP/1.1 200 469 ms crawled 2026-06-01

NL · 20.126.51.172 · AS8075 Microsoft Corporation

Reputation 95/100 weak security headers

Classifying

HTML metadata

Title: INSTAV
Language: cs

Open Graph

url: https://www.instav.cz/
title: INSTAV
locale: cz-CZ
site name: INSTAV

Technology

Analytics

Google Tag Manager

Third-party hosts loaded (2)

www.googletagmanager.com×2
www.freeprivacypolicy.com×1

Contact

Email

info@instav.cz

Phone

+420 469 311 847

Registration

Registrar

REG-INTERNET-CZ

Created

2008-10-09

Expires

2026-10-08 127 days left

Updated

2017-09-05

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

5 instav-cz.mail.protection.outlook.com

Verified for

Microsoft 365

Email authentication strong

SPF: v=spf1 include:spf.protection.outlook.com -all
strict (-all)
DMARC: v=DMARC1; p=quarantine; aspf=s; adkim=s;
policy: quarantine
DKIM: no key found at common selectors

Certificate (current)

R13

from 2026-05-22 to 2026-08-20

Expires in 79 days

Full certificate history on crt.sh ↗

HTTP security headers

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

findings

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