{
  "subnet": {
    "name": "subext1",
    "enable_dhcp": false,
    "network_id": "{netId}",
    "tenant_id": "{tntId}",
    "dns_nameservers": [], 
    "gateway_ip": "192.168.111.254",
    "ipv6_ra_mode": null,
    "allocation_pools": [
      {
        "start": "192.168.111.21",
        "end": "192.168.111.40"
      }
    ],
    "host_routes": [],
    "shared": false,
    "ip_version": 4,
    "ipv6_address_mode": null,
    "cidr": "192.168.111.0/24",
    "id": "{subnetId}",
    "subnetpool_id": null
  }
}