# Fastly::ComputeAclLookup ## Properties | Name | Type | Description | Notes | | ---- | ---- | ----------- | ----- | | **prefix** | **String** | A valid IPv4 or IPv6 address. | [optional] | | **length** | **Integer** | The length of address in the IP addressing space. | [optional] | | **action** | **String** | One of \"ALLOW\" or \"BLOCK\". | [optional] | [[Back to API list]](../../README.md#endpoints) [[Back to README]](../../README.md)