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DNS Lookups in Python with dnspython: A, MX, TXT, NS, TTL, NXDOMAIN vs NoAnswer and Resolver Choice

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Self-Hosting & Infra intermediate 6 min read $0.01 Updated 2026-10-20

Executed against a public resolver (1.1.1.1) for a real domain: A, MX, TXT, NS answers with TTLs from 300 to 86400 seconds, NoAnswer for CNAME on a name that has none, NXDOMAIN for a random subdomain, and SPF text records.

Debug "site not reachable" and email setup from code. Query records against a chosen resolver, read TTLs, tell NXDOMAIN (name does not exist) from NoAnswer (name exists, no such record type), and avoid stale-cache confusion.

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