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
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Frequently asked questions
How do I look up MX records?
Enter domain in DNS lookup; select MX record type.
What DNS records verify domain ownership?
TXT tokens for Google, Microsoft, and CDN verification.
Can I check TXT for SPF?
Yes — query TXT for SPF, DKIM, and DMARC.
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).