nielsleenheer.com

.com crawl

First seen 2026-04-12 · Last seen 2026-05-06 · ok HTTP/1.1 200 679 ms crawled 2026-05-20

US · 172.67.144.198 · AS13335 Cloudflare, Inc.

Reputation 95/100 weak security headers

Classifying

HTML metadata

Title

Home | Hello my name is Niels Leenheer

Language

en-US

Canonical

https://nielsleenheer.com/

Feeds

Open Graph

url: https://nielsleenheer.com/
title: Home | Hello my name is Niels Leenheer
locale: en_US
site name: Hello my name is Niels Leenheer
description: Ever since I saw the very first web browser by Tim Berners-Lee I’ve been fascinated by the web. I love web standards and open source. Currently I run HTML5test.com, created WhichBrowser and I regularly speak at conferences. I am also part of the Fronteers Conference committee. Follow me on Bluesky at @html5test.com and on Mastodon […]

Technology

CDN: Cloudflare
CMS: WordPress

Fonts

Adobe Fonts

Third-party hosts loaded (2)

gmpg.org×1
use.typekit.net×1

Social

Registration

Registrar

Realtime Register B.V.

Created

2017-10-22

Expires

2026-10-22 154 days left

Updated

2025-10-23

Name servers

eva.ns.cloudflare.com
jonah.ns.cloudflare.com

DNS records live

NS

eva.ns.cloudflare.com
jonah.ns.cloudflare.com

Email authentication no MX

SPF: not published
DMARC: not published
DKIM: no key found at common selectors

Certificate (current)

WE1

from 2026-05-17 to 2026-08-15

Expires in 87 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://nielsleenheer.com/

findings

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