How to convert string to IP address and vice versa

Question

how can I convert a string ipAddress (struct in_addr) and vice versa? and how do I turn in unsigned long ipAddress? thanks

Answer 1

Use inet_ntop() and inet_pton() if you need it other way around. Do not use inet_ntoa(), inet_aton() and similar as they are deprecated and don't support ipv6.

Here is a nice guide with quite a few examples.

// IPv4 demo of inet_ntop() and inet_pton()  struct sockaddr_in sa; char str[INET_ADDRSTRLEN];  // store this IP address in sa: inet_pton(AF_INET, "192.0.2.33", &(sa.sin_addr));  // now get it back and print it inet_ntop(AF_INET, &(sa.sin_addr), str, INET_ADDRSTRLEN);  printf("%s\n", str); // prints "192.0.2.33"