**To change a subnet's public IPv4 addressing behavior** This example modifies subnet-1a2b3c4d to specify that all instances launched into this subnet are assigned a public IPv4 address. If the command succeeds, no output is returned. Command:: aws ec2 modify-subnet-attribute --subnet-id subnet-1a2b3c4d --map-public-ip-on-launch **To change a subnet's IPv6 addressing behavior** This example modifies subnet-1a2b3c4d to specify that all instances launched into this subnet are assigned an IPv6 address from the range of the subnet. Command:: aws ec2 modify-subnet-attribute --subnet-id subnet-1a2b3c4d --assign-ipv6-address-on-creation For more information, see `IP Addressing in Your VPC`_ in the *AWS Virtual Private Cloud User Guide*. .. _`IP Addressing in Your VPC`: http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/vpc-ip-addressing.html