issa.cz

.cz dns crawl

First seen 2026-05-18 · Last seen 2026-05-31 · ok HTTP/1.1 200 17092 ms crawled 2026-05-23

CZ · 81.91.222.55 · AS39817 OvaNet, a.s.

Reputation 87/100 weak security headers no dmarc policy

Classifying

HTML metadata

Title: ISSA CZECH - Webové stránky, eshopy, mobilní aplikace, SEO ...
Description: Vyvíjíme webové stránky, e-shopy, mobilní aplikace, programujeme informační systémy. Zabezpečujeme: SEO, PPC, správa domén, webhosting.
Language: cs

Technology

Server: openresty
PHP: 7.2.34 end of life

Analytics

Google Tag Manager

Fonts

Google Fonts

Third-party hosts loaded (3)

fonts.googleapis.com×2
fonts.gstatic.com×1
www.googletagmanager.com×1

DNS records live

NS

dns2.issa.cz
merkur.issa.cz
miramo1.miramo.cz

MX

10 mg.issa.cz

Email authentication weak

SPF: v=spf1 ip4:81.91.222.4 ip4:81.91.222.15 ip4:81.91.222.16 ip4:81.91.222.18 ip4:81.91.222.46 ip4:81.91.222.47 ~all
softfail (~all)
DMARC: not published
DKIM: no key found at common selectors

Certificate (current)

E7

from 2026-04-08 to 2026-07-07

Expires in 37 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 40/100 Checked live page: https://www.issa.cz/

present

x-frame-options

findings

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

Header values

x-frame-options: SAMEORIGIN

Links to (9)

Linked from (12)