Ultimate Guide to Self-Hosted Dynamic DNS: Ditch DuckDNS for KarlDNS
Stop dealing with expiring hostnames and insecure API tokens. Learn how to deploy KarlDNS, a secure, account-free, self-hosted DynDNS using FastAPI, SQLite…
Karl.Fail
Projects
Experiments that became projects. Some useful, some ambitious, all built out of curiosity.
How I Built a Sub-Millisecond Threat Intelligence API for $0
How I built a free, sub-millisecond threat intelligence API using Node-RED to identify malicious IPs and domains. Stop paying vendors for open-source data.
I Spent 250€ on AI Pentesting Agents (PentAGI, Strix, Xalgorix)
Curious if autonomous AI pentesting actually works? I spent 200€ on OpenAI and Claude APIs to test PentAGI, Strix, and Xalgorix. Read my real-world…
The 2026 Guide to Linux Cloud Gaming: Proxmox Passthrough with CachyOS & Sunshine
Build the Ultimate Linux Cloud Gaming Server: A step-by-step guide to Proxmox, CachyOS, and AMD RX 7900 XTX passthrough. Fixes for Vulkan, Sunshine, and…
ClamAV on Steroids: 35,000 YARA Rules and a Lot of Attitude
Built a scalable ClamAV + 35K YARA rule cluster with FastAPI, HAProxy, and DB storage for fast, insightful malware analysis – born out of…
Typosquatterpy: Secure Your Brand with Defensive Domain Registration
Disclaimer: The information provided on this blog is for educational purposes only. The use of hacking tools discussed here is at your own risk. Read it…
Squidward:Continuous Observation and Monitoring
The name Squidward comes from TAD → Threat Modelling, Attack Surface and Data. “Tadl” is the German nickname for…
Hack the Chart, Impress the Party: A (Totally Ethical) Guide to GitHub Glory
We’ve all been there—no exceptions, literally all of us. You’re at a party, chatting up a total cutie, the vibes are immaculate, and then she hits you…
That One Time I Though I Cracked the Stock Market with the Department of Defense
Seven to five years ago, I was absolutely obsessed with the idea of beating the stock market. I dove headfirst into the world of investing, devouring…
The Day I (Almost) Cracked the Eurojackpot Code
Five years ago, a younger and more optimistic Karl, with dreams of cracking the European equivalent of the Powerball, formed a bold thesis: “Surely…
Flexing on LinkedIn with the LinkedIn-Skillbot
This little experiment wasn’t meant to encourage cheating—far from it. It actually began as a casual conversation with a colleague about just how…
Get an A on Moodle Without Breaking a Sweat!
Ah, Moodle quizzes. Love them or hate them, they’re a staple of modern education. Back in the day, when I was a student navigating the endless barrage of…