Find Mac OSX serial number

2 Solutions Collect From Internet About “Find Mac OSX serial number”

The following code is mainly copied from Technical Note TN1103,
with small modifications to return an NSString and to make it compile with ARC:

#include <IOKit/IOKitLib.h>

- (NSString *)getSerialNumber
    NSString *serial = nil;
    io_service_t platformExpert = IOServiceGetMatchingService(kIOMasterPortDefault,
    if (platformExpert) {
        CFTypeRef serialNumberAsCFString =
                                        kCFAllocatorDefault, 0);
        if (serialNumberAsCFString) {
            serial = CFBridgingRelease(serialNumberAsCFString);

    return serial;

You have to add the IOKit.framework to your build settings.

This is the Swift version of the solution:

var serialNumber: String? {
  let platformExpert = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("IOPlatformExpertDevice") )

  guard platformExpert > 0 else {
    return nil

  guard let serialNumber = (IORegistryEntryCreateCFProperty(platformExpert, kIOPlatformSerialNumberKey as CFString, kCFAllocatorDefault, 0).takeUnretainedValue() as? String) else {
    return nil


  return serialNumber