aws ec2 associate-ipam-byoasn
Associates your Autonomous System Number (ASN) with a BYOIP CIDR that you own in the same Amazon Web Services Region. AWS CLI reference
3 options Its page in the AWS CLI reference
Options
--asnA public 2-byte or 4-byte ASN.--cidrThe BYOIP CIDR you want to associate with an ASN.--dry-runChecks whether you have the required permissions for the action, without actually making the request, and provides an error response.