Command option Sample:aws ec2 assign-ipv6-addresses

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Assigns one or more IPv6 addresses to the specified network interface.Show details from next link. https://docs.aws.amazon.com/ja_jp/cli/latest/reference/ec2/assign-ipv6-addresses.html

aws ec2 assign-ipv6-addresses --network-interface-id eni-38664473 --ipv6-address-count 2

assign-ipv6-addresses — AWS CLI 1.16.6 Command Reference : http://docs.aws.amazon.com/cli/latest/reference/ec2/assign-ipv6-addresses.html