network-interface

$ aws ec2 create-network-interface \
--subnet-id subnet-xxxxxxx \
--description "second ip" \
--groups sg-xxxxxxx \
--private-ip-address 10.0.0.16

$ aws ec2 create-network-interface \ --subnet-id subnet-xxxxxxx \ --description "second ip" \ --groups sg-xxxxxxx \ --private-ip-address 10.0.0.16