hi
u can split the ips with strtok and then compare it like this
PHP Code:
IsOk(testIp,ranges,index)
{
r = strtok(ranges,".");
t = strtok(testIp,".");
if(!isdefined(t[index-1])) return false;
if(int(t[index-1]) > int(r[index-1])) return false;
return true;
}
iprangeissmaller = IsOk("123.123.123.10","123.123.123.150",4);