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Series
Building a domain security analyzer from scratch — DNS records, SSL certificates, security headers, and scoring. One step at a time, learning networking and security along the way.
Ever wondered how security tools check if a domain is legit? In this series, we're building one from scratch — a tool that analyzes any domain's security configuration. No fancy frameworks upfront. No overwhelming theory dumps. Just one step at a tim...
In the last post, we built a DNS lookup tool that fetches A records. Now we're adding email security analysis — the records that reveal whether a domain is protected against spoofing. Today's Goal By the end of this post, you'll have a tool that chec...
In the last post, we added email security checks — MX, SPF, and DMARC records. Now we're moving beyond DNS to check something you interact with every day: the padlock in your browser. Today's Goal By the end of this post, you'll understand: What SSL...
In the last post, we added SSL certificate validation. But before we check security headers, let's understand what actually happens when you visit a website. We'll start from the very beginning. Today's Goal By the end of this post, you'll understand...
In the last post, we completed the core analysis features — DNS records, SSL certificates, and HTTP security headers. Our tool works. But there's a problem. The Problem With Our Current Code Open analyzer.py. It's one file with everything jammed toge...
In the last post, we completed the HTTP security headers analysis. Our tool works, but everything lives in one giant file. Before we restructure the project, let's understand how Python organizes code into packages. Why We Need a New Structure Open y...