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copied!<p>You can get IP address through two ways:</p> <p>1- if you want to get the local ip address on the current used netwrok, you can use the following method to retrive it:</p> <pre><code>-(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) { // 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; } </code></pre> <p>2- if you want to get the external IP address then you need to use the following method:</p> <pre><code>-(NSString*)getIP { NSUInteger an_Integer; NSArray * ipItemsArray; NSString *externalIP; NSURL *iPURL = [NSURL URLWithString:@"http://www.dyndns.org/cgi-bin/check_ip.cgi"]; if (iPURL) { NSError *error = nil; NSString *theIpHtml = [NSString stringWithContentsOfURL:iPURL encoding:NSUTF8StringEncoding error:&error]; if (!error) { NSScanner *theScanner; NSString *text = nil; theScanner = [NSScanner scannerWithString:theIpHtml]; while ([theScanner isAtEnd] == NO) { // find start of tag [theScanner scanUpToString:@"<" intoString:NULL] ; // find end of tag [theScanner scanUpToString:@">" intoString:&text] ; // replace the found tag with a space //(you can filter multi-spaces out later if you wish) theIpHtml = [theIpHtml stringByReplacingOccurrencesOfString: [ NSString stringWithFormat:@"%@>", text] withString:@" "] ; ipItemsArray =[theIpHtml componentsSeparatedByString:@" "]; an_Integer=[ipItemsArray indexOfObject:@"Address:"]; externalIP =[ipItemsArray objectAtIndex: ++an_Integer]; } NSLog(@"%@",externalIP); } else { NSLog(@"Oops... g %d, %@", [error code], [error localizedDescription]); } } return externalIP; } </code></pre>

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