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Every project has a default pool of private IPv4 addresses, called default-network-pool. Its CIDR block depends on the region of the project (private regions are marked with *):
RegionCIDR block
eu-north1 (Finland)10.0.0.0/13
eu-west1 (France)10.48.0.0/13
me-west1 (Israel)10.144.0.0/13
us-central1 (Kansas City, Missouri, US)10.96.0.0/13
eu-north2 (Iceland)10.24.0.0/13
uk-south1 (United Kingdom)10.64.0.0/13
These CIDR blocks are allocated for a default network, and a default subnet reuses them. If you need other CIDR blocks, you can either edit the CIDR block of the default private pool or create new pools with the required CIDR blocks. When you choose a custom CIDR block, avoid 172.17.0.0/16. It conflicts with the Docker default bridge network and can make virtual machines unreachable. For more information, see Virtual machine is unreachable due to a Docker subnet conflict.