convex.cz

.cz dns crawl

First seen 2026-06-02 · Last seen 2026-06-02 · ok HTTP/1.1 200 766 ms crawled 2026-06-02

US · 104.21.40.162 · AS13335 Cloudflare, Inc.

Reputation 87/100 weak security headers no dmarc policy

Classifying

HTML metadata

Title: Convex Systems s.r.o.

Technology

CDN: Cloudflare

Fonts

Google Fonts

Third-party hosts loaded (1)

fonts.googleapis.com×1

Registration

Registrar

REG-INTERNET-CZ

Created

2008-05-07

Expires

2029-05-06 1067 days left

Updated

2026-03-02

Name servers

chance.ns.cloudflare.com
ruth.ns.cloudflare.com

DNS records live

NS

chance.ns.cloudflare.com
ruth.ns.cloudflare.com

MX

10 d36fc9aaed69048a.mx2.emailprofi.seznam.cz
20 d36fc9aaed69048a.mx1.emailprofi.seznam.cz

Email authentication weak

SPF: not published
DMARC: not published
DKIM: no key found at common selectors

Certificate (current)

E7

from 2026-04-30 to 2026-07-29

Expires in 56 days

Full certificate history on crt.sh ↗

HTTP security headers

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

findings

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

Links to (13)