Learn about DNS records, email authentication, DNSSEC, and stay updated on DNSai tools and features.
Security
Six weeks of reporting on the Hugging Face intrusion, the Irregular misconfiguration and the AI-doom argument. Every failure traces to a human decision.
Dns
Looking for a BuiltWith alternative? Page profilers and DNS read different layers of a company's stack. What each method sees, and what it cannot.
Security
How to find dangling DNS records in your own zone: what a dangling CNAME really is, how to inventory CNAME targets, and how to triage what you find.
Dns
How to find the SaaS vendors in a company's SPF record: what include: really means, what macro records hide, and 14 live lookups from 2026-08-01.
Email
RFC 9989 says a discovered p=none MUST NOT change mail handling. The evidence-driven path from DMARC p=none to p=reject, and why the pct tag is gone.
Email
How to identify the email gateway a company uses from its MX records: vendor hostname patterns, RFC priority rules, and live 2026-08-01 lookups.