A block of IP addresses defined by a start address and a mask/prefix (network CIDR). An IP block is typically large & allocated to a tenant for automated consumption. An IP block is always a contiguous address space, for example 192.0.0.1⁄8. An IP block can be further subdivided into subnets called IP block subnets. These IP block subnets can be added to IP pools and used for IP allocation.