Master DNS from the Ground Up
Whether you're a beginner or looking to deepen your knowledge, our comprehensive guides will help you understand and manage DNS like a pro.
How TLS Certificates Work, and Why They Are About to Get Much Shorter
Chain of trust, ACME issuance, Certificate Transparency, why revocation never worked, and the 200 / 100 / 47-day lifetime caps arriving 2026 to 2029. With illustrations.
Why We Report a Range, Not an Exact Time
Outage durations from any outside monitor are interval-bound. Why we report verified bounds instead of dressing a guess up as a measurement.
Allowlist Our Checks
Bot protection (Vercel, Cloudflare, DataDome, Imperva) can challenge our monitors and blind your monitoring. The two-minute allowlist rule, per provider.
What is DNS? A Complete Beginner's Guide
Understand how the Domain Name System works, from basic concepts to the DNS resolution process that powers the internet.
DNS Record Types Explained
Learn about A, AAAA, MX, NS, TXT, CNAME, SOA, CAA, and other DNS record types. Understand when and how to use each one.
How DNS Propagation Works
Discover why DNS changes take time to propagate globally, what affects propagation speed, and how to minimize delays.
DNS Security Best Practices
Protect your domain with DNSSEC, CAA records, and email authentication. Learn to prevent DNS hijacking and spoofing attacks.
Ready to Put Your Knowledge to Practice?
Use our free DNS tools to lookup, analyze, and monitor your domain's DNS configuration.