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The IPv4 IP address of the endpoint on which you want Amazon Route 53 to perform health checks. If you don't specify a value for IPAddress, Amazon Route 53 sends a DNS request to resolve the domain name that you specify in FullyQualifiedDomainName at the interval that you specify in RequestInterval. Using an IP address that DNS returns, Amazon Route 53 then checks the health of the endpoint.

If the endpoint is an Amazon EC2 instance, we recommend that you create an Elastic IP address, associate it with your Amazon EC2 instance, and specify the Elastic IP address for IPAddress. This ensures that the IP address of your instance will never change.

For more information, see HealthCheckConfig$FullyQualifiedDomainName.

Contraints: Amazon Route 53 cannot check the health of endpoints for which the IP address is in local, private, non-routable, or multicast ranges. For more information about IP addresses for which you cannot create health checks, see RFC 5735, Special Use IPv4 Addresses ( and RFC 6598, IANA-Reserved IPv4 Prefix for Shared Address Space (

When the value of Type is CALCULATED or CLOUDWATCH_METRIC, omit IPAddress.