IP address to binary in C

Question

I have an ip address like so:

address = '192.168.1.11';

and need to convert it to its binary format

11000000 10101000 00000001 00001011

I have some ideas on how to leftshift the decimal number and using inet_addr, but not sure how I would go about doing it.

Thanks, I'm still new to C.

Answer 1

There is a socket function specific for transforming text IP into a 32-bit "longip" address, but this might be unecessary in this context. A simple form would be to parse it using sscanf():

char ip[] = "192.168.1.11";
int n1, n2, n3, n4;
sscanf(ip, "%d.%d.%d.%d", &n1, &n2, &n3, &n4).

// Result:

// n1 = 192
// n2 = 168
// n3 = 1
// n4 = 11