indexo.dev

mathijssterrenburg.com

.com crawl

First seen 2026-04-15 · Last seen 2026-05-07 · ok HTTP/1.1 200 2554 ms crawled 2026-05-09

SG · 23.106.55.197 · AS59253 LEASEWEB SINGAPORE PTE. LTD.

Reputation 92/100 no dmarc policy

Classifying

HTML metadata

Title
Strategic Design for Social & Environmental Impact
Description
Hi, I'm Mathijs Sterrenburg, a freelance designer & creative director using strategic design to address social & environmental challenges.
Language
en-US
Generator
WordPress 6.9.4
Canonical
https://mathijssterrenburg.com/

Open Graph

url
https://mathijssterrenburg.com/
title
Mathijs Sterrenburg - Positive impact through design
locale
en_US
site name
Mathijs Sterrenburg
description
A Dutch creative director & designer who helps changemakers around the world with design, tech & strategy.

Technology

CMS
WordPress

Social

Registration

Registrar
NameCheap, Inc.
Created
2015-08-03
Expires
2027-08-03 438 days left
Updated
2025-07-09
Name servers
  • ns1.greengeeks.net
  • ns2.greengeeks.net

DNS records live

NS
  • ns1.greengeeks.net
  • ns2.greengeeks.net
MX
  • 0 mathijssterrenburg.com

Email authentication weak

SPF
v=spf1 ip4:23.106.55.197 include:spf.greengeeks.net +a +mx +ip4:23.106.53.146 ~all
softfail (~all)
DMARC
not published
DKIM
  • default: v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAz9I88KrkPTzyCBDQvSb48jT9LNF9SALOHplX584yGkRbGZlTBrGIROObtSYesIfVTqNcrwZBd4Iykt…
selectors probed

Certificate (current)

R13
from 2026-03-26 to 2026-06-25
Expires in 34 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 70/100 Checked live page: https://mathijssterrenburg.com/

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
SAMEORIGIN
x-content-type-options
nosniff
strict-transport-security
max-age=31536000; includeSubDomains; preload

Links to (3)

Linked from (1)