http://www.cymru.com/Documents/bogon-dd.html
check the list headed up
Dotted Decimal Aggregated
If you have trouble working ouy the netmasks, then try http://jodies.de/ipcalc enter in the starting IP range ie 176.0.0.0 and netmask of 248.0.0.0 and it'll give you
HostMin: 176.0.0.1
HostMax: 183.255.255.254
It also kindly shows you just how to apply the netmask for those that wish to learn
EDIT: Oh I should also point out http://www.cymru.com/Documents/bogon-list.html this pages details recent changes, so you can see if a network provider are not updating their lists, which is very very bad.