isp.cz

.cz crawl

First seen 2026-05-28 · Last seen 2026-05-31 · ok HTTP/1.1 200 2036 ms crawled 2026-05-30

US · 104.17.71.73 · AS13335 Cloudflare, Inc.

Reputation 100/100

Classifying

HTML metadata

Title: Home - International School of Prague
Description: Home - International School of Prague
Language: en-US
Canonical: https://www.isp.cz/

Open Graph

url: https://www.isp.cz/
title: Home - International School of Prague
description: Home - International School of Prague

Technology

CDN: Cloudflare
CMS: Gatsby

Analytics

Cloudflare Insights
Google Tag Manager

Third-party hosts loaded (4)

ask.ai.finalsite.com×1
resources.finalsite.net×1
static.cloudflareinsights.com×1
www.googletagmanager.com×1

Social

Contact

Phone

+420 220 384 111

Registration

Registrar

REG-THINLINE

Created

1997-02-17

Expires

2026-10-05 126 days left

Updated

2026-05-03

Name servers

ns1.thinline.cz
ns2.thinline.cz
ns3.cesky-hosting.eu

DNS records live

NS

ns1.thinline.cz
ns2.thinline.cz
ns3.cesky-hosting.eu

MX

1 aspmx.l.google.com
10 alt3.aspmx.l.google.com
10 alt4.aspmx.l.google.com
5 alt1.aspmx.l.google.com
5 alt2.aspmx.l.google.com

TXT

benq-domain-verification=eyJpdiI6ImdwRFMzZHk2VFlITHBnRmZMK0o2MHc9PSIsInZhbHVlIjoiQmhOeVl3L0ZuSjRBTlJYZEhhU0wvVVBTcUEvL3A5RktBWjBPM3U2Yzhrbz0iLCJtYWMiOiIyZjU3ZTNkZTVjOGJmMmJiNGM3ZTA5NWI0N2ZhZjBiN2M4MGVlMjIxYTJiMjJhNzhmYjYyYTYzMWIzYjJmMDVlIiwidGFnIjoiIn0=

Verified for

Adobe
Apple
Google
Microsoft 365
Zoom

Email authentication strong

SPF

v=spf1 include:spf.cesky-hosting.cz include:_spf.google.com ip4:82.142.82.99 ip4:82.142.82.123 ip4:82.142.82.124 ip4:82.142.82.125 -all

strict (-all)

DMARC

v=DMARC1; p=quarantine; rua=mailto:itcoordinator@isp.cz; ruf=mailto:itcoordinator@isp.cz

policy: quarantine

DKIM

google: v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAhNBHSWzptc4nHOVmVK9sWUxuRNx1Hs3lWfCmK7xoM3vzlsm18Ac65Cj35GiWTGP4fwFRzFr+tVqFC+…

selectors probed

Certificate (current)

from 2026-05-08 to 2026-08-06

Expires in 67 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 95/100 Checked live page: https://www.isp.cz/

present

strict-transport-security
content-security-policy
x-frame-options
x-content-type-options
referrer-policy

findings

missing Permissions Policy

Header values

referrer-policy: strict-origin-when-cross-origin
x-frame-options: SAMEORIGIN
x-content-type-options: nosniff
content-security-policy: frame-ancestors 'self';
strict-transport-security: max-age=31536000