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DNS records determine how a domain reaches websites, email and verification services.
Record types
A maps to IPv4, AAAA maps to IPv6, CNAME creates an alias, MX selects mail servers and TXT carries verification and email authentication data.
TTL
TTL controls how long resolvers cache a response. Existing answers may remain visible until their previous TTL expires.
Change checklist
- Export current records.
- Verify target values.
- Keep old services online during propagation.
- Test website and email after the change.
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