DNS records & domain policy
Technical guides about dns records & domain policy, written for practical follow-up.
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5 articlesRead DNS records when a website or email service stops working
Use A, AAAA, CNAME, MX and TXT evidence to isolate delegation, record and cache problems before changing a zone.
DNSSEC validation: read the AD flag and the chain behind it
Distinguish resolver assertions, signed zones and broken delegation evidence before changing DS or DNSKEY records.
Domain names, Unicode and Punycode: inspect the exact hostname
Separate a domain label, URL and registrable name, then review internationalised names without treating conversion as a trust verdict.
CAA records: authorise certificate issuers without blocking renewals
Review issuer tags, wildcard handling and inherited policies before a certificate renewal reaches its deadline.
Plan a DNS migration around TTLs and real cache behaviour
Build a cutover timeline that accounts for old TTLs, negative caching, resolver policy and application connections.
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5 guides