Check DNS A Records

An A record is a DNS record that maps a domain name to an IPv4 IP address. For example, the A record maps to the IP address. The IPv6 equivalent of an A record is a AAAA (quad A) record.

A records are also be referred to as "address records" and "host records", and are defined in RFC 1035.

DNS Check can monitor your A records, and notify you if they become unresolvable, or start resolving to the wrong IP address.


Here are the fields that make up an A record:

Field Description Example
Name A fully qualified domain name (FQDN).
Type The DNS record type. Always set to "A". A
Address An IPv4 IP address.

DNS Zone File Examples

Here's an example of how an A record looks in a DNS zone file:

; Name           Type  Address A

The Name ends in a period in the above example, so it's a fully qualified domain name.

Alternatively, you can create an A record that's relative to the zone file's $ORIGIN. Here's an example of how to use this technique to define the same record as in the previous example:

; Name           Type  Address
www              A

Additional Resources

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