differ.nl

.nl crawl

First seen 2026-05-11 · Last seen 2026-05-16 · ok HTTP/1.1 200 7216 ms crawled 2026-05-16

NL · 192.42.127.33 · AS1103 SURF B.V.

Reputation 75/100 wrong cert

Classifying

HTML metadata

Title: DIFFER | Dutch Institute for Fundamental Energy Research
Language: en
Generator: Drupal 10 (https://www.drupal.org)
Canonical: https://www.differ.nl/

Technology

Server: Apache
CMS: Drupal

Analytics

Google Tag Manager

Fonts

Font Awesome

Social widgets

YouTube Embed

Third-party hosts loaded (4)

cdn.jsdelivr.net×2
use.fontawesome.com×1
www.googletagmanager.com×1
www.youtube-nocookie.com×1

Social

Contact

Phone

40 3334 999

Registration

Registrar

SURF B.V.

Created

2003-08-15

Updated

2026-03-31

Name servers

ns3.surfnet.nl
ns1.zurich.surf.net
ns2.surfnet.nl
ns1.surfnet.nl

DNS records live

NS

ns1.surfnet.nl
ns1.zurich.surf.net
ns2.surfnet.nl
ns3.surfnet.nl

MX

10 differ-nl.a-v1.mx.microsoft

TXT

Show 9 TXT records

KnJSdwcOBIiy77W+E21aMr1utlteyvkxPjGJnebuAbRVnsn3lJlR2dmvLlW8RRIK3QiCvxdmNcA3Xl45uOrG7A==
HARICA-N5NxJrvyH7fxnlct2uj
MS=ms56178611
Nfv/10AhfoYPCbVY81MmTkFuZzlDwHso83jN/kNuQAPyy2xsaC3xuiCnITXH4PBguscmGOqlXDrZAz2GNaAqeg==
google-site-verification=s51-XLNWSQX7ZkTilM1ixbQ_I5vuDWsPugqERoYiffg
MS=ms18486511
MS=ms29521523
MS=87B562FB786AE58A0A2B0BEF7FBB66FD315AEAE1
ltL2ne2tnMqeyz6j+D/7SIRu5/t4rHnvqY8bWwPZUs2phwga1/OIXfw5FtZM/EASipMnOVKwHSsHHUt0DAxGdg==

Email authentication strong

SPF

v=spf1 ip4:192.42.127.4 ip4:192.42.127.5 ip4:192.42.127.204 ip6:2001:610:520:70::204 include:spf.protection.outlook.com -all

strict (-all)

DMARC

v=DMARC1; p=reject; sp=reject; rua=mailto:dmarc@differ.nl; ruf=mailto:dmarc@differ.nl

policy: reject (enforced) · sp=reject

DKIM

Show 4 DKIM selectors

default: v=DKIM1; h=sha256; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsF2jRKc74hlPxN5kDKY3hef9j7qRUp0Dc44CG6HK9YQ9kI3aRfy8ExinKrhXmbdhV0gD…
selector1: v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAuXVjdKUUlxHgXj3Dkzfm555fL0mse/+oqp3/puDPDHAAG2UzdcwpFwRJifiLFMmdPGSSWsjHFOqyEc…
selector2: v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAz3oyaEnMEdTkl2KMJ/KzakqDsCo4I7Rxs6hflUGgSCxKIDn5qLTKhKJz4esrvS4q4lMNgffaEE6OaE…
k2: v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAv2aC2KjGKLOwTweBY5A9RpjsxaBXR9r7OAU6U8/zn92ivImI75naUujWbItRI/QmL1jy5PWGqLwoUA…

selectors probed

Certificate (current) wrong cert

GEANT TLS ECC 1

from 2025-09-23 to 2026-09-23

Expires in 127 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 65/100 Checked live page: https://www.differ.nl/

present

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

findings

missing Content Security Policy
weak frame protection
weak content type protection
missing Permissions Policy

Header values

referrer-policy: strict-origin
x-frame-options: SAMEORIGIN, SAMEORIGIN
x-content-type-options: nosniff, nosniff
strict-transport-security: max-age=63072000; includeSubDomains

Links to (4)

Linked from (1)

gauss-fusion.com×1