DNS pillar hub
DNS & email guides
Authoritative guides on DNS records, MX/TXT/SPF/DKIM/DMARC, TTL propagation, and CNAME — with links to the DNS Checker and DIG tool.
MX and TXT Records Explained — Check Online
Complete guide to MX and TXT DNS records: mail routing, SPF, DKIM, DMARC, verification tokens, and how to check them online with DN01.
How to Check DNS Records Online
Step-by-step guide to checking A, AAAA, MX, NS, TXT, CNAME, SOA, CAA, and SRV records online before nameserver or hosting changes.
DNS A Record Explained — IPv4 Lookup Guide
What DNS A and AAAA records do, how A record lookup tools work, CDN caveats, and verifying IPv4/IPv6 before go-live.
SPF, DKIM & DMARC DNS Guide — Email Auth
How SPF, DKIM, and DMARC TXT records work together, example strings, alignment basics, and verifying mail authentication with DNS Checker.
CNAME Record Explained — Aliases & Pitfalls
How DNS CNAME records alias one name to another, apex limitations, conflicts with other record types, and checking CNAME with DNS Checker.
DNS TTL & Propagation — How Long Changes Take
What DNS TTL means, realistic propagation timelines, lowering TTL before migrations, and verifying updates with DNS Checker vs propagation maps.
DNS Propagation Checklist — Verify Every Change
Step-by-step checklist for confirming DNS changes propagated before closing migration tickets.
DMARC Policy Staging — From p=none to reject
How to roll out DMARC safely: reporting first, then quarantine, then reject.
DKIM Selector Rotation — DNS Update Guide
Rotate DKIM keys without mail gaps: dual selectors, TTL, and verification.
Nameserver Delegation Audit — NS Consistency
Audit NS records across registrar, parent zone, and child zone before cutover.
Email Deliverability DNS Checklist
MX, SPF, DKIM, DMARC, PTR, and blacklist checks before bulk sends.
IPv6 Dual-Stack DNS Basics
Publish AAAA responsibly, verify both stacks, and avoid broken IPv6-only paths.