lennart.xyz

.xyz crawl

First seen 2026-05-30 · Last seen 2026-06-01 · ok HTTP/1.1 200 785 ms crawled 2026-05-31

NL · 141.138.169.228 · AS20847 Previder B.V.

Reputation 100/100

Classifying

HTML metadata

Title: Lennart Koster — webbouwer Groningen
Description: Websites sinds 2012 voor mkb, stichtingen en semi-overheid. WordPress en maatwerk (o.a. Beaver Builder), vaak samen met een ontwerper. Ook docent CMD aan de Hanzehogeschool.
Language: nl

Technology

CDN: Vercel
CMS: Next.js

Social

Contact

Email

Registration

Registrar

Hosting Concepts B.V. d/b/a Registrar.eu

Created

2018-02-23

Expires

2027-02-23 264 days left

Updated

2026-03-26

Name servers

webhostingserver.g1-dns.one
webhostingserver.g1-dns.com

DNS records live

NS

webhostingserver.g1-dns.com
webhostingserver.g1-dns.one

MX

10 mail.lennart.xyz

Email authentication strong

SPF: v=spf1 a mx ip4:195.211.72.0/22 ip4:141.138.168.0/21 ip6:2a03:3c00:a001::/48 ip6:2a03:3c00:a002::/48 ~all
softfail (~all)
DMARC: v=DMARC1; p=quarantine
policy: quarantine
DKIM: no key found at common selectors

Certificate (current)

R13

from 2026-05-15 to 2026-08-13

Expires in 70 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 50/100 Checked live page: https://portfolio.lennart.xyz/

present

strict-transport-security

findings

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

Header values

strict-transport-security: max-age=63072000