Does anyone know a way that can keep servers on the same network stop stealing IPs? (using other block of Ips assigned to other server) ?

I dont quite understand what you mean by that.

How can they steal ip's that are assigned to you?
Unless they go into your registration and change the info for your domain.....

Server A was assigned a block of IP address to use for his client. Server B ran out of IP and decided to use one of the IP addres that was assigned to server A. The domain of that IP address is now unaccessible.

yeah, if this is your network, unplug his box for 10 minutes, see if the IP thieve likes it, then tell him next time you wont be pluggin it back (worked for us) .. hehe :D

Set up each host on a sub network of addresses.

Hi there,

what we do is set up a subnet for each customer and creating a vlan in the switch configuration. That should pretty much do the job :-)

Cu, Moritz