DNS Lookup Guide — A, MX, TXT Records
Query DNS for email migration, domain verification, and CDN cutover troubleshooting.
Published June 1, 2025 · 1 min read
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DNS lookup for A, AAAA, MX, and TXT
Email deliverability, subdomain cutovers, and CDN migrations start with DNS. The DNS lookup tool queries public resolvers for common record types.
Typical checks
- MX records before migrating Google Workspace
- TXT for SPF, DKIM, and domain verification tokens
- Compare with public IP when whitelisting office egress
Sources & references
Primary references used when researching and fact-checking this guide. See our editorial methodology.
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Adobe PDF Reference — encryption
— Adobe
PDF password protection and encryption standards (ISO 32000). -
Ghostscript documentation — PDF settings
— Artifex Software
Compression level behavior and PDF output settings.