how to get ip address of iphone programmatically [

Question

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• iPhone/iPad/OSX: How to get my IP address programmatically? 9 answers

I got a webserver up and running in iphone by using Mongoose. But the problem is how can I get the ip address of my iphone/ipad to let the user's know where they can access the server. I found that [NSHost addresses] can do the job but I am developing for app store and this is undocumented method.

Answer 1

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

// Get the INTERNAL ip address

- (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;

} 

https://web.archive.org/web/20160527165909/http://www.makebetterthings.com/iphone/how-to-find-ip-address-of-iphone/

Answer 2

I believe [NSHost address]; is documented, it's listed here: http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSHost_Class/Reference/Reference.html

Use [[NSHost currentHost] address]; to get the IP.