# R53\_ZONE

`R53_ZONE` lets you specify the AWS Zone ID for an entire domain ([`D()`](/language-reference/top-level-functions/d.md)) or a specific [`R53_ALIAS()`](/language-reference/domain-modifiers/service-provider-specific/amazon-route-53/r53_alias.md) record.

When used with [`D()`](/language-reference/top-level-functions/d.md), it sets the zone id of the domain. This can be used to differentiate between split horizon domains in public and private zones. See this [example](/provider/route53.md#split-horizon) in the [Amazon Route 53 provider page](/provider/route53.md).

When used with [`R53_ALIAS()`](/language-reference/domain-modifiers/service-provider-specific/amazon-route-53/r53_alias.md) it sets the required Route53 hosted zone id in a R53\_ALIAS record. See [`R53_ALIAS()`](/language-reference/domain-modifiers/service-provider-specific/amazon-route-53/r53_alias.md) documentation for details.


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