ubuntu@ip-10-20-100-90:~/allcode/charms/layers/layer-fiche$ juju spaces
Space                  Subnets
common-infrastructure  10.20.200.0/24

ubuntu@ip-10-20-100-90:~/allcode/charms/layers/layer-fiche$ juju subnets
subnets:
  10.20.200.0/24:
    type: ipv4
    provider-id: subnet-ed956ac0
    status: in-use
    space: common-infrastructure
    zones:
    - us-east-1a