4dotnet.nl

.nl crawl

First seen 2026-06-01 · Last seen 2026-06-03 · ok HTTP/1.1 200 1251 ms crawled 2026-06-02

NL · 37.97.228.74 · AS20857 Signet B.V.

Reputation 94/100 dmarc monitor-only

Classifying

HTML metadata

Title: Detachering en training van .NET ontwikkelaars | 4Dotnet
Description: 4Dotnet biedt detachering van consultants en trainingen voor .NET ontwikkelaars zodat jouw onderneming de kennis in huis krijgt die nodig is om te groeien.
Language: nl

Technology

CMS: Nuxt
JS framework: Nuxt, Vue

Third-party hosts loaded (1)

js.hs-scripts.com×1

Social

Contact

Phone

+3188 241 44 00

DNS records live

NS

ns01.netunity.net
ns02.netunity.net

MX

10 4dotnet-nl.mail.protection.outlook.com

Verified for

Google
Microsoft 365

Email authentication partial

SPF

v=spf1 a mx ip4:178.251.26.65 ip6:2a00:1938:1:a007:0:1:2:2 ip4:37.97.228.76 ip6:2a01:7c8:fffd:3e8::1 include:spf.protection.outlook.com include:6472041.spf10.hubspotemail.net include:spf.liftsoftware.nl -all

strict (-all)

DMARC

v=DMARC1; p=none; sp=none; pct=100; adkim=r; aspf=r; rua=mailto:watchdog2@watchdog.kevlarr.io; rf=afrf; fo=0; ri=86400

policy: none (monitoring only) · sp=none

DKIM

selector1: v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC7N0EcpkTtwE51xZv5AHN/lxpzJkp6xkSktVvzOlQGqyI5H8RsvdWqcTH15ylT8D4xiTXF7atTqVw9SgEehC…
k1: k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDbNrX2cY/GUKIFx2G/1I00ftdAj713WP9AQ1xir85i89sA2guU0ta4UX1Xzm06XIU6iBP41VwmPwBGRNofhBVR+e6WHUo…
smtpapi: k=rsa; t=s; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDPtW5iwpXVPiH5FzJ7Nrl8USzuY9zqqzjE0D1r04xDN6qwziDnmgcFNNfMewVKN2D1O+2J9N14hRprzByFwfQW76…

selectors probed

Certificate (current)

Sectigo Public Server Authentication CA DV R36

from 2026-05-22 to 2026-12-07

Expires in 185 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 70/100 Checked live page: https://www.4dotnet.nl

present

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

findings

missing Content Security Policy
missing Referrer Policy
missing Permissions Policy

Header values

x-frame-options: DENY
x-content-type-options: nosniff
strict-transport-security: max-age=315360000; preload