Posted on March 26, 2025 in Personal • Tagged with Work, Life, Business • 8 min read
My thoughts after achieving the lifelong goal of creating a profitable Internet business. It turns out that you must be careful what you wish for.
Posted on October 01, 2023 in Uncategorized • Tagged with Update, News • 1 min read
Posted on July 31, 2022 in Programming • Tagged with autonomous system, ASN, API, Security • 4 min read
In the Internet, each IP Address belongs to an autonomous system (AS). In this blog article, it is demonstrated how any IP address can be mapped to an AS number. The necessary information and sources to map each IP Address to an Autnomous System is provided as well, since they were not easy to find.
Posted on May 29, 2022 in Open Source • Tagged with db.js, in-memory database, key-value storage, JSON file persistance • 5 min read
Instead of using one of the many battle proofed and reliable database solutions out there, I rather created my own solution. In this quick blog post, I am announcing the release of db.js - A in-memory database with persistant file storage.
Posted on March 09, 2022 in Security • Tagged with API, Datacenter, Hosting, Cloud-Provider, IP API, Bot-Detection, VPN-Detection, IP-Intelligence, IP-Lookup • 8 min read
It is not entirely trivial to find out if an IP address belongs to a datacenter / cloud provider. In this blog article, I try to find an algorithm that outputs with high confidence if an IPv4 / Ipv6 address belongs to a hosting provider or not.
Posted on January 18, 2022 in Security • Tagged with TLS Fingerprinting, TLS 1.2, TLS 1.3 • 16 min read
In this blog post, I highlight the core differences between TLS 1.2 and TLS 1.3 and investigate how we can use several properties of the protocol to obtain fingerprinting entropy from TLS clients.