Check if a string is a valid IP address (IPv4 and IPv6)

This function checks if an IP address (either IPv4 or IPv6) is valid.


/** Check if an IP address is valid.

 Looks for both IPv4 and IPv6.
 Based on: http://stackoverflow.com/questions/1679152/how-to-validate-an-ip-address-with-regular-expression-in-objective-c/10971521#10971521

 @param ip IP address as string.
 @return Returns true if given IP address is valid, false otherwise.

 */
+ (BOOL)isValidIpAddress:(NSString *)ip {
    const char *utf8 = [ip UTF8String];

    // Check valid IPv4.
    struct in_addr dst;
    int success = inet_pton(AF_INET, utf8, &(dst.s_addr));
    if (success != 1) {
        // Check valid IPv6.
        struct in6_addr dst6;
        success = inet_pton(AF_INET6, utf8, &dst6);
    }
    return (success == 1);
}


Download the ready-for-use source file (.m) of Check if a string is a valid IP address (IPv4 and IPv6)