#include <ifaddrs.h> #include <arpa/inet.h>

 +(NSString *)getIPAddress

{

    NSString *address = @"error";

    struct ifaddrs *interfaces = NULL;

    struct ifaddrs *temp_addr = NULL;

    int success = 0;

    

    // retrieve the current interfaces - returns 0 on success

    success = getifaddrs(&interfaces);

    if (success == 0)

    {

        // Loop through linked list of interfaces

        temp_addr = interfaces;

        while(temp_addr != NULL)

        {

            if(temp_addr->ifa_addr->sa_family == AF_INET)

            {

                // Check if interface is en0 which is the wifi connection on the iPhone

                if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"])

                {

                    // Get NSString from C String

                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];

                }

            }

            

            temp_addr = temp_addr->ifa_next;

        }

    }

    

    // Free memory

    freeifaddrs(interfaces);

    

    return address;

}

 

 

From:http://blog.zachwaugh.com/post/309927273/programmatically-retrieving-ip-address-of-iphone