psi.cz

.cz crawl

First seen 2026-06-01 · Last seen 2026-06-03 · ok HTTP/1.1 200 276 ms crawled 2026-06-02

CZ · 46.28.106.41 · AS197019 WEDOS Internet, a.s.

Reputation 95/100 weak security headers

Classifying

HTML metadata

Title: Photon Systems Instruments
Description: PSI (Photon Systems Instruments) company is a leader in manufacturing instrumentation for advanced measurement and imaging of optical signals in plants and algae, particularly in the field of chlorophyll fluorescence/reflectance techniques.
Language: en

Technology

Server: Apache
Stack: PHP

Analytics

Google Tag Manager

Third-party hosts loaded (1)

www.googletagmanager.com×1

DNS records live

NS

ns.web4u.cz
ns2.web4u.cz

MX

0 psi-cz.mail.protection.outlook.com

Verified for

Brevo
Google
Microsoft 365

Email authentication strong

SPF

v=spf1 ip4:176.74.156.140 include:spf.protection.outlook.com -all

strict (-all)

DMARC

v=DMARC1; p=quarantine; pct=100; rua=mailto:dmarc@psi.cz,mailto:rua@dmarc.brevo.com; ruf=mailto:dmarc@psi.cz

policy: quarantine

DKIM

selector1: v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA2ywSxHmb3kukNvMMWHS4CFKmPEmFyP5DGKOENcqPU6XPJvstdAhTtG1kCTUcIT5mzUXXLoEecIM23G…
selector2: v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQD4DVkMwfZi8M2BI2/MRbx1ed8S9NyC/LixIL9B4gQ5mwNhGXVOECUlbdCiij2zULPxeRI2yw1PwUF5Uxuga8…

selectors probed

Certificate (current)

R13

from 2026-04-07 to 2026-07-06

Expires in 33 days

Full certificate history on crt.sh ↗

HTTP security headers

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

findings

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