Deep dives, tutorials, and analysis on the protocols, security, and performance of the Domain Name System.
DNS propagation isn't magic — it's caching. Learn how TTL controls update speed, why different resolvers see different results, and how to verify changes.
A practical overview of DNS security: how DNSSEC authenticates responses, why DNS-over-HTTPS matters, and what you can do today to protect your domains.
When DNS breaks, everything breaks. Learn a methodical approach to diagnosing DNS problems, from total resolution failure to intermittent issues.
How DNSSEC uses cryptographic signatures to protect DNS responses from tampering, and why adoption still lags behind.
DoH encrypts DNS queries inside HTTPS, improving privacy but sparking debate among network operators and security teams.
Practical techniques for reducing DNS lookup latency, from aggressive caching strategies to anycast network design.
Step-by-step guide to setting up a network-wide DNS sinkhole that blocks ads and trackers at the resolver level.
CAA records let you specify which certificate authorities can issue certificates for your domain. Here is why you need them.
Architecting DNS for resilience with health checks, weighted routing, and multi-provider redundancy patterns.