This is the personal website of Dr. rer. nat. Henning Kerstan, Germany. You can contact me via email (mailhenningkerstan.de), or via phone (+49 203 87846129).
Have a look at the copyright page for information about authorship, copyright and licensing.
Data protection and privacy
As this is a personal website, the European General Data Protection Regulation (GDPR) does not apply (see Art. 2 (2) lit. (c) GDPR). I have nevertheless taken the best possible measures to avoid processing and storage of personal data. In particular, this page
- does not automatically load any external resources like fonts, java script, etc. (however, it does contain clickable links to external resources, see below) and it
- does not set any cookies or uses tracking tools.
However, there is some minimal processing and logging of metadata (see below) when you visit this website.
Data processed and logged when you visit this website
When you visit this website, your browser sends a request to the web server, on which this website is hosted. Such a request consists of
- your IP address (e.g.
- the time and date of the request (e.g.
- the HTTP request (e.g.
- the requested resource (e.g.
- the protocol (e.g.
- a status code (e.g.
2oo) which the server returned to you (see section 6 of RFC7231 for the possible status codes),
- the referrer HTTP request header (e.g.
https://henningkerstan.de) indicating the page your browser reports having been referred from (see section 5.5.2 of RFC 7231 for a detailed specification),
- the user agent HTTP request header containing some information sent by your browser, typically consisting of the operating system (e.g.
Windows NT 10.0; Win64; x64) and the browser (e.g.
This website is hosted on a web server of netcup GmbH, Daimlerstraße 25, D-76185 Karlsruhe, netcup.de (“Netcup”). Netcup logs the above information and keeps them for 14 days.
I use Google Workspace for my emails
Since I use Google Workspace, any email you send to adresses on this domain (i.e. any adresses ending with @henningkerstan.de or @henningkerstan.org) will be handled by Google servers. Thus, your email will be processed by and stored on servers of
- Google LLC (formerly known as Google Inc.), 1600 Amphitheatre Parkway, Mountain View, California 94043 USA or
- Google Ireland Limited,
- Google Asia Pacific Pte. Ltd., or
- any other entity that directly or indirectly controls, is controlled by, or is under common control with Google LLC.
I use sipgate’s VoIP service for the provided phone number
The provided phone number +49 203 87846129 is a VoIP number provided by sipgate GmbH Gladbacher Str. 74, 40219 Düsseldorf which I forward to my mobile phone. Therefore sipgate will process your call, store call-related metadata and might even store a voice mail (if you choose to leave a message).
Do you have questions on data protection and privacy?
Feel free to contact me in case of any questions or concerns regarding data protection and privacy in relation to your use of this website.
Links to third party resources
This website contains links to external, third party resources (websites, images, pdf-files and other files). At the time of linking these resources, I have taken utmost care
- to check that the links work,
- that the content is genuine, and
- that the content does not contain any offensive material.
However, please note that these resources are not under my control and I do not have the resources to permanently keep track of all changes. If you discover a broken link or discover that a link points to inappropriate material, just contact me and I will try to remedy the problem as soon as possible.