indexo.dev

sijthoff.nl

.nl crawl

First seen 2026-05-21 · Last seen 2026-05-27 · ok HTTP/1.1 200 2200 ms crawled 2026-05-27

NL · 93.119.8.16 · AS20857 Signet B.V.

Reputation 89/100 weak security headers dmarc monitor-only

Classifying

HTML metadata

Title
Sijthoff - Today's leadership
Description
Sijthoff: alles onder één dak om jouw business een boost te geven. Marktleider in overheid, tech, marcom, HR, finance, M&A en business.
Language
nl-NL
Generator
Site Kit by Google 1.179.0
Canonical
https://www.sijthoff.nl/
Feeds

Open Graph

url
https://www.sijthoff.nl/
title
Sijthoff - Today's leadership
locale
nl_NL
site name
Sijthoff
description
Sijthoff: alles onder één dak om jouw business een boost te geven. Marktleider in overheid, tech, marcom, HR, finance, M&A en business.

Technology

Server
Apache
CMS
WordPress
PHP
8.3.2 security-only
jQuery
1.11.1 known XSS (<3.5)
Analytics
  • Google Tag Manager
Cookie consent
  • Usercentrics
Fonts
  • Font Awesome
Third-party hosts loaded (8)
  • www.googletagmanager.com×4
  • app.usercentrics.eu×2
  • campaign5-forms-form-api.ternairsoftware.com×2
  • aggregator.service.usercentrics.eu×1
  • ajax.googleapis.com×1
  • api.usercentrics.eu×1
  • use.fontawesome.com×1
  • www.google.com×1

Social

Contact

Phone

DNS records live

NS
  • ns5.mr-wolf.nl
  • ns6.mr-wolf.nl
MX
  • 10 mail.sijthoff.nl

Email authentication partial

SPF
v=spf1 a mx a:mail.sijthoff.nl/24 include:_spf.mr-wolf.nl -all
strict (-all)
DMARC
v=DMARC1; p=none; sp=none; rua=mailto:dmarc_reports@mr-wolf.nl; aspf=r; adkim=r; pct=100; fo=s; ri=3600; ruf=mailto:dmarc_forensic@mr-wolf.nl
policy: none (monitoring only) · sp=none
DKIM
no key found at common selectors

Certificate (current)

E7
from 2026-04-27 to 2026-07-26
Expires in 56 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://www.sijthoff.nl/

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

Links to (5)