Find IP address in iphone

Question

I want to find IP address in an application. I am able to find it. But, problem is, it works fins in iphone os 2.0 or so. But, in iphone os 3.0 it is giving me a warning:

warning: no '+currentHost' method found

warning: (Messages without a matching method signature)

I am using this code, and it works fine with os version 2.0.

-(NSString*)getAddress {
char iphone_ip[255];
strcpy(iphone_ip,"127.0.0.1"); // if everything fails
NSHost* myhost = [NSHost currentHost];
if (myhost)
{
    NSString *ad = [myhost address];
    if (ad)
        strcpy(iphone_ip,[ad cStringUsingEncoding: NSISOLatin1StringEncoding]);
}
return [NSString stringWithFormat:@"%s",iphone_ip];

}

How to find IP address in iphone os 3.0 or greater os version?

Thanks in advance.

The easiest (IMHO) is just to fetch the external IP from a website, rather then query the interface. — Rev316, Mar 14 '10 at 21:05

score 6 · Answer 1 · answered May 05 '12 at 04:28

#include <arpa/inet.h>
#include <netdb.h>
#include <net/if.h>
#include <ifaddrs.h>

// retun the host name
+ (NSString *)hostname
{
    char baseHostName[256]; 
    int success = gethostname(baseHostName, 255);
    if (success != 0) return nil;
    baseHostName[255] = '\0';

#if !TARGET_IPHONE_SIMULATOR
    return [NSString stringWithFormat:@"%s.local", baseHostName];
#else
    return [NSString stringWithFormat:@"%s", baseHostName];
#endif
}

// return IP Address
+ (NSString *)localIPAddress
{
    struct hostent *host = gethostbyname([[self hostname] UTF8String]);
    if (!host) {herror("resolv"); return nil;}
    struct in_addr **list = (struct in_addr **)host->h_addr_list;
    return [NSString stringWithCString:inet_ntoa(*list[0]) encoding:NSUTF8StringEncoding];
}

nice solution. seems the best one – Dani Pralea Oct 15 '13 at 20:28 — Dani Pralea, Oct 15 '13 at 20:28

Erik · Answer 2 · 2018-02-21T20:57:35.237

4

Put this script on a web server running PHP:

<?php
$ip = getenv("REMOTE_ADDR");
echo $ip;
?>

Call this on the device:

NSURL *scriptURL = [[NSURL alloc] initWithString:@"http://yourserver.com/script.php"]; 
NSString *ip = [NSString stringWithContentsOfURL: scriptURL encoding:NSASCIIStringEncoding error:nil];

edited Feb 21 '18 at 20:57

answered May 14 '12 at 10:46

Erik

2,138
18
18

nice, but it doesn't work without an internet connection. and it's kinda against the purpose, since you normally want the local ip address – Dani Pralea Oct 15 '13 at 20:28

score 4 · Answer 3 · answered Mar 02 '10 at 11:45

4

As far as I know there is only one hacky way to do that. You basically open a socket and get its address using POSIX functions. Here is the code I used for this:

http://iphonesdksnippets.com/post/2009/09/07/Get-IP-address-of-iPhone.aspx

[NSHost currentHost] will also work, but it is deprecated and considered a "Private API" by Apple, so you won't be able to submit your application to App Store.

answered Mar 02 '10 at 11:45

Wicharek

192
1
6

What about IPv6? Is there any code example on how to retrieve it? – Oded Regev Jun 27 '12 at 11:43

score 3 · Answer 4 · edited Apr 26 '12 at 22:53

- (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
        // it may also be en1 on your ipad3.
            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; 
}

Use this to get your IP

If any errors Please use

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

`en0` returned `127.0.0.1` for me on my ipad3, I had to use `en1`... Not sure how permanent that fix is... — Soup, Apr 26 '12 at 17:30

score 1 · Answer 5 · edited May 05 '12 at 11:28

1

You should have a look to this good project: uidevice-extension

Specialy this class

Import UIDevice-Reachability.h in your project then try with one of those commands:

NSString *myIp = [UIDevice localIPAddress];
NSString *myIp = [UIDevice localWiFiIPAddress];
NSString *myIp = [UIDevice whatismyipdotcom]; // is using @aamritrao solution

edited May 05 '12 at 11:28

Flexo

87,323
22
191
272

answered May 05 '12 at 06:20

Martin Magakian

3,746
5
37
53

@Nikita P you need to import the class UIDevice-Reachability.m then you will be able to call those function. And yes they are public – Martin Magakian May 22 '13 at 12:33
thnaks. I just wanted to know if i can use them on app-store apps – Nikita P May 23 '13 at 05:34
As this class is using public function only you can use them on the App Store – Martin Magakian May 27 '13 at 06:24

score 1 · Answer 6 · answered Mar 14 '10 at 21:00

1

Getting the IP address is a bit hacky. Are you sure you couldn't live with the device ID (UDID) that is unique to each iPhone and can be retrieved easily via the public API ?

[UIDevice currentDevice].uniqueIdentifier

answered Mar 14 '10 at 21:00

yonel

7,855
2
44
51

score 1 · Answer 7 · answered Sep 25 '11 at 18:06

There is one more way to get the IP address and that too Global IP

NSString*  ip=@"http://www.whatismyip.org/";
NSURL *url = [[NSURL alloc] initWithString:ip]; 
NSString *ans = [NSString stringWithContentsOfURL:url encoding:NSASCIIStringEncoding error:&error];
NSLog(@"%@",ans);

The above site will give you the Global IP. Just put this in your code and use the IP address where ever you want and also get the location of the user using your app as this gives global IP.

score 0 · Answer 8 · answered Oct 01 '11 at 21:02

bool success;
struct ifaddrs *addrs;
const struct ifaddrs *cursor;
const struct sockaddr_dl *dlAddr;
const uint8_t *base;
int i;

success = getifaddrs(&addrs) == 0;
if (success) {
    cursor = addrs;
    while (cursor != NULL) {
        if ( (cursor->ifa_addr->sa_family == AF_LINK)
            && (((const struct sockaddr_dl *) cursor->ifa_addr)->sdl_type ==IFT_ETHER)
            ) {
            dlAddr = (const struct sockaddr_dl *) cursor->ifa_addr;
            //      fprintf(stderr, " sdl_nlen = %d\n", dlAddr->sdl_nlen);
            //      fprintf(stderr, " sdl_alen = %d\n", dlAddr->sdl_alen);
            base = (const uint8_t *) &dlAddr->sdl_data[dlAddr->sdl_nlen];
            printf(" MAC address ");
            for (i = 0; i < dlAddr->sdl_alen; i++) {
                if (i != 0) {
                    printf(":");
                }
                printf("%02x", base[i]);
            } 
            printf("\n");
        }
        cursor = cursor->ifa_next;
    }
}

Find IP address in iphone

8 Answers8

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