indexo.dev

christiaanhuygenscollege.nl

.nl crawl

First seen 2026-06-04 · Last seen 2026-06-04 · ok HTTP/1.1 200 621 ms crawled 2026-06-04

NL · 84.241.177.39 · AS20847 Previder B.V.

Reputation 92/100 spf without fallback

sector education type homepage

HTML metadata

Title
Christiaan Huygens College
Language
nl-NL

Technology

CMS
Gatsby
Fonts
  • Google Fonts

Third-party hosts loaded (1)

  • fonts.googleapis.com×2

Social

Contact

Email

DNS records live

NS
  • ns1.openprovider.nl
  • ns1.svou.nl
  • ns2.openprovider.be
  • ns2.svou.nl
  • ns3.openprovider.eu
MX
  • 0 christiaanhuygenscollege-nl.h-v1.mx.microsoft
Verified for
  • Microsoft 365

Email authentication strong

SPF
v=spf1 redirect=sscscholen.nl
missing all
DMARC
v=DMARC1; p=quarantine; pct=100; rua=mailto:dmarc@sscscholen.uriports.com; ruf=mailto:dmarc@sscscholen.uriports.com; fo=1:d:s
policy: quarantine
DKIM
  • selector1: v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC2MG+NDk7Ci13Dd9rEyRoCLJwbYkFClhOJ6QoYwWvJqdGTUxdY7Fgzq2i3ieMdn8CAGuhq58hBqtasXURoDu…
  • selector2: v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDkpGmJnhjACvHR0+Kpt8PPWaN2KyX7HfzMSsBnRS0LuQTNHIdypONXNjwhidXL26C+/RNjIcMe3ZtLjnCs9p…
selectors probed

Certificate (current)

R13
from 2026-05-25 to 2026-08-23
Expires in 79 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 80/100 Checked live page: https://christiaanhuygenscollege.nl/

present
  • strict-transport-security
  • x-frame-options
  • x-content-type-options
  • referrer-policy
  • permissions-policy
findings
  • missing Content Security Policy
Header values
referrer-policy
strict-origin-when-cross-origin
x-frame-options
SAMEORIGIN
permissions-policy
geolocation=()
x-content-type-options
nosniff
strict-transport-security
max-age=31536000

Links to (6)

Linked from (1)