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#include < sys/socket.h > #include < sys/sysctl.h > #include < net/if.h> #include < net/if_dl.h >    ...    - (NSString *)getMacAddress {   int                 mgmtInfoBase[6];   char                *msgBuffer = NULL;   size_t              length;   unsigned char       macAddress[6];   struct if_msghdr    *interfaceMsgStruct;   struct sockaddr_dl  *socketStruct;   NSString            *errorFlag = NULL;      // Setup the management Information Base (mib)   mgmtInfoBase[0] = CTL_NET;        // Request network subsystem   mgmtInfoBase[1] = AF_ROUTE;       // Routing table info   mgmtInfoBase[2] = 0;                mgmtInfoBase[3] = AF_LINK;        // Request link layer information   mgmtInfoBase[4] = NET_RT_IFLIST;  // Request all configured interfaces      // With all configured interfaces requested, get handle index   if ((mgmtInfoBase[5] = if_nametoindex("en0")) == 0)     errorFlag = @"if_nametoindex failure";   else   {     // Get the size of the data available (store in len)     if (sysctl(mgmtInfoBase, 6, NULL, &length, NULL, 0) < 0)       errorFlag = @"sysctl mgmtInfoBase failure";     else     {       // Alloc memory based on above call       if ((msgBuffer = malloc(length)) == NULL)         errorFlag = @"buffer allocation failure";       else       {         // Get system information, store in buffer         if (sysctl(mgmtInfoBase, 6, msgBuffer, &length, NULL, 0) < 0)           errorFlag = @"sysctl msgBuffer failure";       }     }   }      // Befor going any further...   if (errorFlag != NULL)   {     NSLog(@"Error: %@", errorFlag);     return errorFlag;   }      // Map msgbuffer to interface message structure   interfaceMsgStruct = (struct if_msghdr *) msgBuffer;      // Map to link-level socket structure   socketStruct = (struct sockaddr_dl *) (interfaceMsgStruct + 1);      // Copy link layer address data in socket structure to an array   memcpy(&macAddress, socketStruct->sdl_data + socketStruct->sdl_nlen, 6);      // Read from char array into a string object, into traditional Mac address format   NSString *macAddressString = [NSString stringWithFormat:@"%02X:%02X:%02X:%02X:%02X:%02X",                                 macAddress[0], macAddress[1], macAddress[2],                                 macAddress[3], macAddress[4], macAddress[5]];   NSLog(@"Mac Address: %@", macAddressString);      // Release the buffer memory   free(msgBuffer);      return macAddressString; }

출처 - http://iphonedevelopertips.com/device/determine-mac-address.html