Erik,
A good number of network devices out there (think home routers) default to 192.168.0.0/24 to their IP network and many people leave them at this. Not sure if this may be something to do with the problems so people experience ?
Many devices also give out the 10.0 range - whereas i have yet to come across a device in the 172.16 range as a default
I think it would be far smarter to give out one of the 172.16.x ranges as the default.
RFC1918 name IP address range number of addresses largest CIDR block (subnet mask) host id size mask bits classful description[Note 1]
24-bit block 10.0.0.0 - 10.255.255.255 16,777,216 10.0.0.0/8 (255.0.0.0) 24 bits 8 bits single class A network
20-bit block 172.16.0.0 - 172.31.255.255 1,048,576 172.16.0.0/12 (255.240.0.0) 20 bits 12 bits 16 contiguous class B networks
16-bit block 192.168.0.0 - 192.168.255.255 65,536 192.168.0.0/16 (255.255.0.0) 16 bits 16 bits 256 contiguous class C networks
Craig