ipPrefixLength property
The size of the desired subnet.
Use usual CIDR range notation. For example, '29' to find unused x.x.x.x/29 CIDR range. The goal is to determine if one of the allocated ranges has enough free space for a subnet of the requested size. GCE disallows subnets with prefix_length > 29
Required.
Implementation
core.int? ipPrefixLength;