indexo.dev

duo-onderwijs.nl

.nl crawl

First seen 2026-06-16 · Last seen 2026-06-16 · ok HTTP/1.1 200 963 ms crawled 2026-06-16

NL · 80.69.67.43 · AS34762 Combell NV

Reputation 89/100 weak security headers dmarc monitor-only

Classifying

HTML metadata

Title
Onderwijsonderzoek & Advies | DUO-Onderwijs
Description
Onderzoek en advies voor onderwijsinstellingen sinds 1995. Helder inzicht en onderbouwd advies. Ontdek wat wij voor jou kunnen doen.
Language
nl-NL
Generator
WordPress 7.0
Canonical
https://duo-onderwijs.nl/
Translations
  • en ×2
  • nl ×2

Open Graph

url
https://duo-onderwijs.nl/
title
DUO-Onderwijs
locale
nl_NL
site name
DUO-Onderwijs
description
Samen versterken we scholen

Technology

Server
nginx
CMS
WordPress 7.0
jQuery
3.7.1
Analytics
  • Google Tag Manager

Third-party hosts loaded (4)

  • ajax.googleapis.com×1
  • gmpg.org×1
  • www.google.com×1
  • www.googletagmanager.com×1

Social

Contact

Email
Phone

Registration

Registrar
team.blue nl B.V.
Created
2024-06-05
Updated
2026-04-28
Name servers
  • ns0.transip.net
  • ns2.transip.eu
  • ns1.transip.nl

DNS records live

NS
  • ns0.transip.net
  • ns1.transip.nl
  • ns2.transip.eu
MX
  • 0 duoonderwijs-nl0i.mail.protection.outlook.com
Verified for
  • Airtable
  • Brevo
  • Microsoft 365

Email authentication partial

SPF
v=spf1 ip4:80.69.67.43 ip4:89.20.175.155 ip6:2a01:7c8:f0:1172:0:2:6c94:b391 include:sendgrid.net include:spf.protection.outlook.com include:spf.flowmailer.net include:_spf.emailclick.nl -all
strict (-all)
DMARC
v=DMARC1; p=none; rua=mailto:ipm7pgb@ar.glockapps.com,mailto:dmarc-reports@duo-onderwijs.nl; ruf=mailto:ipm7pgb@fr.glockapps.com; adkim=s; aspf=s; fo=1;
policy: none (monitoring only)
DKIM
Show 5 DKIM selectors
  • selector1: v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAx5eba1cwNDaDQRC4o6dGqNhEzhpLI561sBGRRjZcUUlqAdhjPYid1AB0qoPvLDJc2fZvOFQ5PnT0sH…
  • selector2: v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEApls+Dq0u3VaAvWYeUlXDmT8iFw/ml9xf51pw7cH7eKgXd2FEqL/KfrsKbbQUA7z/6SkJKbuaGYFVdR…
  • mail: k=rsa;p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDeMVIzrCa3T14JsNY0IRv5/2V1/v2itlviLQBwXsa7shBD6TrBkswsFUToPyMRWC9tbR/5ey0nRBH0ZVxp+lsmTxid2Y2z…
  • s1: k=rsa; t=s; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtAYgm95EJteoRFT/NlOqnUy//uxv/qsKZ88tVi3TMv+UKi1OxWgQ613A3Aix0cDMenUQc/O/hLjIQHtNKb…
  • s2: k=rsa; t=s; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAugh2loIiCCB8ZipVa7XonggfQCx4GlpLZE66crDf0cHvPM9CIeL0guFKgRXwkH8fJQL7ZbSC90xhIaByqg…
selectors probed

Certificate (current)

R13
from 2026-05-10 to 2026-08-08
Expires in 52 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 45/100 Checked live page: https://duo-onderwijs.nl/

present
  • strict-transport-security
findings
  • short HSTS max-age
  • missing Content Security Policy
  • missing frame protection
  • missing content type protection
  • missing Referrer Policy
  • missing Permissions Policy
Header values
strict-transport-security
max-age=300; includeSubDomains; preload

Links to (4)

Linked from (1)

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