chs.us — Carl Sampsonhttps://chs.us/en-uscarl.sampson@gmail.com (Carl Sampson)carl.sampson@gmail.com (Carl Sampson)Wed, 08 Jul 2026 12:00:00 +0000Building an authoritative DNS server in ~200 lineshttps://chs.us/2026/07/authoritative-dns-from-scratch/Wed, 08 Jul 2026 12:00:00 +0000carl.sampson@gmail.com (Carl Sampson)https://chs.us/2026/07/authoritative-dns-from-scratch/An OAST platform needs to own a zone and answer anything under it. Here's a from-scratch authoritative DNS server — wildcards, apex records, deliverable MX, and answering your own ACME challenges — and the protocol subtleties that bite.SecurityDnsNetworkingOastPythonDnslibInfrastructure