jan-siefken.com

.com crawl

First seen 2026-04-13 · Last seen 2026-05-12 · ok HTTP/1.1 200 1606 ms crawled 2026-05-07

DE · 85.13.162.52 · AS34788 Neue Medien Muennich GmbH

Reputation 87/100 weak security headers no dmarc policy

Classifying

HTML metadata

Title: Jans Blog - Computer und Internet News
Description: Jans Blog: Neueste Computer- und Internet-News, Tipps zur Optimierung der Online-Präsenz, immer auf dem neusten Stand der Technik.
Language: de
Canonical: https://www.jan-siefken.com/

Open Graph

url: https://www.jan-siefken.com/
title: Jans Blog - Computer und Internet News
locale: de_DE
site name: Jans Blog
description: Jans Blog: Neueste Computer- und Internet-News, Tipps zur Optimierung der Online-Präsenz, immer auf dem neusten Stand der Technik.

Technology

Server: nginx
CMS: WordPress

Ads

Google AdSense

Social widgets

YouTube Embed

Third-party hosts loaded (3)

pagead2.googlesyndication.com×4
www.youtube.com×2
gmpg.org×1

Social

Registration

Registrar

RegistryGate GmbH

Created

2008-04-07

Expires

2027-04-07 323 days left

Updated

2026-04-08

Name servers

ns5.kasserver.com
ns6.kasserver.com

DNS records live

NS

ns5.kasserver.com
ns6.kasserver.com

MX

10 w009c882.kasserver.com

Email authentication partial

SPF: v=spf1 a mx include:spf.kasserver.com ~all
softfail (~all)
DMARC: not published
DKIM: no key found at common selectors

Certificate (current)

R13

from 2026-04-01 to 2026-06-30

Expires in 42 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 45/100 Checked live page: https://www.jan-siefken.com/

present

strict-transport-security

findings

short HSTS max-age
missing Content Security Policy
missing frame protection
missing content type protection
missing Referrer Policy
missing Permissions Policy

Header values

strict-transport-security: max-age=600000