A and AAAA records
An A record contains an IPv4 address and an AAAA record contains an IPv6 address. A domain can publish either type or both at the same time.
Aliases are followed by the system resolver, so the final list contains the addresses currently returned for the requested hostname.
Why a domain has several IP addresses
Large services distribute traffic across servers and regions. Load balancing, content delivery networks and DNS rotation can therefore return several valid addresses.
Answers can differ by resolver, location and time. The checker displays the complete unique set returned during the current lookup, with IPv4 before IPv6.
How to interpret the result
Provider and location values describe the network that owns each address. They are useful for diagnostics but do not prove where the application or its users are physically located.
- A missing A record does not mean IPv6 is unavailable; check AAAA records too.
- An address change can be a normal consequence of DNS or infrastructure updates.
- The lookup shows current records, not historical addresses or subdomains.