IPv4 vs IPv6 DNS Lookups

IPv4 and IPv6 use different DNS record types. A working A record does not prove IPv6 works, and a broken AAAA record can affect users on IPv6-preferred net

IPv4 and IPv6 use different DNS record types. A working A record does not prove IPv6 works, and a broken AAAA record can affect users on IPv6-preferred networks.

Key points

Check A and AAAA separately.
Remove broken AAAA records if IPv6 is not configured.
Test from networks that actually use IPv6.
Do not assume desktop and mobile networks behave the same.

Where dig fits

Dig is useful because it lets you ask DNS one precise question at a time. Instead of guessing why a website, email system, or service is failing, you can check the record type that controls that part of the setup.

Practical next step

Start with the record type that matches the symptom. Use A or AAAA for website address issues, MX and TXT for email, CNAME for provider aliases, and NS or SOA for delegation problems.