> 1.0.0.0 to 127.255.255.255 is class a > 128.0.0.0 to 191.255.255.255 is class b > 192.0.0.0 to 223.255.255.255 is class c > 224.0.0.0 to 239.255.255.255.is class d, multicast There are no more class a/b/c networks. This is old stuff and shouldn't be included in a FAQ. Thilo