A C Program To determine IP class from an IP address. Copy and compile this on your computer.
#include<bits/stdc++.h>
int main()
{
char ip[50];
gets(ip);
int i;
for(i=0; i<=strlen(ip); i++)
{
if(ip[i] == '.')
ip[i] = '\0';
}
int ip_part = atoi(ip);
if(ip_part<=127 && ip_part>=0)
printf("Class A");
else if(ip_part<=191 && ip_part>=128)
printf("Class B");
else if(ip_part<=223 && ip_part>=192)
printf("Class C");
else if(ip_part<=239 && ip_part>=224)
printf("Class D");
return 0;
}