erv.cz

.cz crawl

First seen 2026-06-03 · Last seen 2026-06-03 · ok HTTP/1.1 200 231 ms crawled 2026-06-03

CZ · 81.91.86.12 · AS39790 Web4U s.r.o.

Reputation 87/100 weak security headers no dmarc policy

Classifying

HTML metadata

Title: ERV - Ekologický rozvoj a výstavba s.r.o.
Language: cs

Technology

Server: openresty
PHP: 5.3.10 end of life
Stack: PHP

Third-party hosts loaded (1)

maps.google.com×1

Contact

Phone

+420491520468

DNS records live

NS

ns.web4u.cz
ns2.web4u.cz

MX

10 erv-cz.mail.protection.outlook.com

Verified for

Microsoft 365

Email authentication weak

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

Certificate (current)

R13

from 2026-05-03 to 2026-08-01

Expires in 57 days

Full certificate history on crt.sh ↗

HTTP security headers

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

findings

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

Links to (1)

google.com×1

Linked from (1)

josefov.com×1