**To associate an IPv6 CIDR block with a VPC** This example associates an IPv6 CIDR block with a VPC. Command:: aws ec2 associate-vpc-cidr-block --amazon-provided-ipv6-cidr-block --vpc-id vpc-a034d6c4 Output:: { "Ipv6CidrBlockAssociation": { "Ipv6CidrBlockState": { "State": "associating" }, "AssociationId": "vpc-cidr-assoc-eca54085" }, "VpcId": "vpc-a034d6c4" } **To associate an additional IPv4 CIDR block with a VPC** This example associates the IPv4 CIDR block ``10.2.0.0/16`` with VPC ``vpc-1a2b3c4d``. Command:: aws ec2 associate-vpc-cidr-block --vpc-id vpc-1a2b3c4d --cidr-block 10.2.0.0/16 Output:: { "CidrBlockAssociation": { "AssociationId": "vpc-cidr-assoc-2447724d", "CidrBlock": "10.2.0.0/16", "CidrBlockState": { "State": "associating" } }, "VpcId": "vpc-1a2b3c4d" }