Deep dives into networking, security, DNS, and the technology behind CheckMySys.
Your IP address doesn't contain your location, your name, or your browsing history. Here's what it does reveal, how geolocation databases work, and what VPNs actually change.
Speed tests measure TCP throughput to a specific server, not some absolute property of your connection. Here's what's really happening when you click 'Start Test' — and why results vary.
Password entropy measures how hard a password is to guess. Here's how to calculate it, why length beats complexity, and what 'estimated crack time' actually assumes.
Your browser reveals a surprising amount of identifying information without cookies or logins. Here's how fingerprinting works, which signals matter most, and what actually reduces your uniqueness.
A practical guide to DNS record types: what each one does, when you need it, and real-world examples from setting up email to verifying domain ownership.