In Foreman 1.8 one can manage subnets through the web-interface at Infrastructure > Subnets. However, when I add a /24 (e.g. 10.10.0.0 with a subnetmask of 255.255.255.0), I cannot add anything less specific below this subnet (e.g. a /28 - 10.10.0.0 with a subnet mask of 255.255.255.240) as foreman claims that it "has already been taken". It seems that the checking mechanism is not taking the subnetmask into account.
Currently I use racktables to manage the subnets, but it would be convenient and less error-prone to migrate this part to foreman, too.
Is there a - preferably not too hacky - way to do this?