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How does neutron choose subnet

I have Mitaka installed, running classic Open vSwitch implementation with core components plus Horizon and Heat. I have a private network defined with 2 subnets. I've read that you cannot control which subnet an instance is deployed to, though it would be a nice "feature" to add ;-)

My question is this - how does neutron choose a subnet? In my case, it seems to pick the most recent one that I defined, but I'm guessing that's just due to the names. Is there an algorithm that explains the subnet selection process?