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DNS AAAA record lookup

Enter a hostname to retrieve published AAAA records.

Back to DNS lookups tools

What this checks

IPv6 addresses for the hostname, TTL, dual-stack presence alongside A records, and resolution status.

Why it matters

Dual-stack mail infrastructure requires valid AAAA records. Missing IPv6 can cause timeouts on IPv6-preferring networks.

Run check

Live diagnostic — results run from MailFleet tool APIs or locally in your browser.

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Required to prevent automated abuse of public tools.

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Results

Common issues

  • Publishing AAAA without matching PTR for IPv6 sending paths.
  • IPv6-only DNS gaps when clients still connect over IPv4.
  • Ignoring TTL when planning infrastructure cutovers.

How to fix

  • Confirm whether your SMTP provider sends over IPv4, IPv6, or both.
  • Publish consistent A and AAAA records for dual-stack mail hosts.
  • Re-test connectivity after DNS TTL expires.

How MailFleet helps

MailFleet provider tests help confirm which IP families your SMTP path uses after DNS validation.

Related free tools

Delivery note: MailFleet helps users manage campaigns through their own sending providers. Delivery outcomes depend on sender reputation, DNS authentication, content quality, recipient engagement, list quality, provider rules, and mailbox filtering systems.

For regulatory context on commercial email in the United States, see the FTC CAN-SPAM compliance guide.

Frequently asked questions

If your server or provider sends over IPv6, ensure matching PTR and forward DNS. Many setups are IPv4-only today.

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