Hi Christoph, I'm afraid you cannot build asymetric subnets. This is because subnets are generated by applying a bitmask to the former host part, which is just a mathematic operation like subnets=(2^former-host-bits/2^netmask-bits)-2. This means all subnets are of the same size. Consider a bigger netmask, why not divide the adress space by 8, which means you could use 14 adresses per subnet. Hope that helps ... Thorsten ! -- Sent through Global Message Exchange - http://www.gmx.net