DNS checker

A record (IPv4 address)

The A record maps a domain to the IPv4 address of the server that hosts it — the numeric address your browser actually connects to after it looks the name up. A domain can have several, for redundancy or load balancing.

AAAA record (IPv6 address)

The AAAA record is the same idea for IPv6 — the newer, much larger address space. Many domains publish both A and AAAA records so visitors connect over whichever their network supports.

MX record (mail servers)

MX records tell other mail servers where to deliver email for the domain. Each has a priority number — lower is tried first, with higher numbers acting as backups. No MX record usually means the domain doesn't receive email.

TXT record (text records)

TXT records hold free-form text used for verification and email authentication — things like SPF, DKIM, and domain-ownership checks. They're how a domain proves to other services that it controls itself.

NS record (name servers)

NS records list the authoritative name servers responsible for the domain — the servers that hold the real answers for it. They tell the rest of the internet who to ask.

CNAME record (alias)

A CNAME points one name at another — for example, www pointing at the root domain. The lookup then follows the target's records. It's an alias, not a destination address.