b3b.cz

.cz dns

First seen 2026-06-01 · Last seen 2026-06-01 · ok HTTP/1.1 200 500 ms crawled 2026-06-01

CZ · 87.236.195.35 · AS35592 Coolhousing s.r.o.

Reputation 87/100 weak security headers no dmarc policy

Classifying

HTML metadata

Title: B3B – Solutions in the field of information technology and television
Description: We offer solutions and products in the field of computer and television networks, and computer technology.
Language: en

Technology

Server: Apache
jQuery: 1.7.2 known XSS (<3.5)

DNS records live

NS

ns1.b3b.cz
ns4.b3b.cz

MX

10 mail2.b3b.cz

Email authentication weak

SPF: v=spf1 mx a:smtp.b3b.cz ip4:87.236.195.35 ip6:2a01:5f0:c001:107:e::2 -all
strict (-all)
DMARC: not published
DKIM: no key found at common selectors

Certificate (current)

R13

from 2026-05-02 to 2026-07-31

Expires in 59 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://b3b.cz/en/

findings

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