Get MAC Address of System in Java -

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this question has answer here:

i need mac address of system running program. not able that.

i writing following code:

public class app{         public static void main(string[] args){          inetaddress ip;         try {              ip = inetaddress.getlocalhost();             system.out.println("current ip address : " + ip.gethostaddress());              networkinterface network = networkinterface.getbyinetaddress(ip);              byte[] mac = network.gethardwareaddress();              system.out.print("current mac address : ");              stringbuilder sb = new stringbuilder();             (int = 0; < mac.length; i++) {                 sb.append(string.format("%02x%s", mac[i], (i < mac.length - 1) ? "-" : ""));                     }             system.out.println(sb.tostring());          } catch (unknownhostexception e) {              e.printstacktrace();          } catch (socketexception e){              e.printstacktrace();          }         }      }

and getting following results:

 current ip address : 14.96.192.202  current mac address :

i not getting mac address blank.

i saw example here

if account multiple interfaces, , null mac addresses (i'm running java 7 on windows 7 vmware installed (so have virtual network adapters)) code seems work:

public static void main(string[] args) {   try {     inetaddress ip = inetaddress.getlocalhost();     system.out.println("current ip address : " + ip.gethostaddress());      enumeration<networkinterface> networks = networkinterface.getnetworkinterfaces();     while(networks.hasmoreelements()) {       networkinterface network = networks.nextelement();       byte[] mac = network.gethardwareaddress();        if(mac != null) {         system.out.print("current mac address : ");          stringbuilder sb = new stringbuilder();         (int = 0; < mac.length; i++) {           sb.append(string.format("%02x%s", mac[i], (i < mac.length - 1) ? "-" : ""));         }         system.out.println(sb.tostring());       }     }   } catch (unknownhostexception e) {     e.printstacktrace();   } catch (socketexception e){     e.printstacktrace();   } }

here (a sanitized version of) see on computer when run it:

current ip address : {i'm not telling :)} current mac address :  current mac address : {actual hardware interface} current mac address : 00-00-00-00-00-00-00-e0 current mac address : 00-00-00-00-00-00-00-e0 current mac address : 00-00-00-00-00-00-00-e0 current mac address : 00-00-00-00-00-00-00-e0 current mac address : 00-00-00-00-00-00-00-e0 current mac address : 00-50-56-c0-00-01 current mac address : 00-50-56-c0-00-08

and here output of running ipconfig /all

c:\>ipconfig /all  windows ip configuration (minus actual interface because don't sharing kind of information :)  ethernet adapter local area connection 2:     media state . . . . . . . . . . . : media disconnected    connection-specific dns suffix  . :    description . . . . . . . . . . . : gbridge virtual private network adapter    physical address. . . . . . . . . : 02-50-f2-ce-82-01    dhcp enabled. . . . . . . . . . . : yes    autoconfiguration enabled . . . . : yes  ethernet adapter vmware network adapter vmnet1:     connection-specific dns suffix  . :    description . . . . . . . . . . . : vmware virtual ethernet adapter vmnet1    physical address. . . . . . . . . : 00-50-56-c0-00-01    dhcp enabled. . . . . . . . . . . : no    autoconfiguration enabled . . . . : yes    link-local ipv6 address . . . . . : fe80::9c27:3d03:da2c:f14d%19(preferred)    autoconfiguration ipv4 address. . : {hidden}(preferred)    subnet mask . . . . . . . . . . . : 255.255.0.0    default gateway . . . . . . . . . :    dhcpv6 iaid . . . . . . . . . . . : 268456022    dhcpv6 client duid. . . . . . . . : 00-01-00-01-13-db-d9-cb-b8-ac-6f-af-9d-f2    dns servers . . . . . . . . . . . : fec0:0:0:ffff::1%1                                        fec0:0:0:ffff::2%1                                        fec0:0:0:ffff::3%1    netbios on tcpip. . . . . . . . : enabled  ethernet adapter vmware network adapter vmnet8:     connection-specific dns suffix  . :    description . . . . . . . . . . . : vmware virtual ethernet adapter vmnet8    physical address. . . . . . . . . : 00-50-56-c0-00-08    dhcp enabled. . . . . . . . . . . : no    autoconfiguration enabled . . . . : yes    link-local ipv6 address . . . . . : fe80::cdbb:434:7fd9:2574%20(preferred)    ipv4 address. . . . . . . . . . . : 192.168.42.1(preferred)    subnet mask . . . . . . . . . . . : 255.255.255.0    default gateway . . . . . . . . . :    dhcpv6 iaid . . . . . . . . . . . : 285233238    dhcpv6 client duid. . . . . . . . : 00-01-00-01-13-db-d9-cb-b8-ac-6f-af-9d-f2    dns servers . . . . . . . . . . . : fec0:0:0:ffff::1%1                                        fec0:0:0:ffff::2%1                                        fec0:0:0:ffff::3%1    netbios on tcpip. . . . . . . . : enabled  tunnel adapter 6to4 adapter:     description . . . . . . . . . . . : microsoft 6to4 adapter    physical address. . . . . . . . . : 00-00-00-00-00-00-00-e0    dhcp enabled. . . . . . . . . . . : no    autoconfiguration enabled . . . . : yes    ipv6 address. . . . . . . . . . . : 2002:204c:1bc6::204c:1bc6(preferred)    default gateway . . . . . . . . . :    netbios on tcpip. . . . . . . . : disabled  tunnel adapter isatap.{3e45cb42-bc1e-4f89-9c16-25166c0eaba1}:     media state . . . . . . . . . . . : media disconnected    connection-specific dns suffix  . :    description . . . . . . . . . . . : microsoft isatap adapter    physical address. . . . . . . . . : 00-00-00-00-00-00-00-e0    dhcp enabled. . . . . . . . . . . : no    autoconfiguration enabled . . . . : yes  tunnel adapter isatap.{77f1fadc-02ba-44af-9fdf-97e23f8b5fe7}:     media state . . . . . . . . . . . : media disconnected    connection-specific dns suffix  . :    description . . . . . . . . . . . : microsoft isatap adapter #3    physical address. . . . . . . . . : 00-00-00-00-00-00-00-e0    dhcp enabled. . . . . . . . . . . : no    autoconfiguration enabled . . . . : yes  tunnel adapter isatap.{608257ac-c0f3-43a5-8595-898533c95d90}:     media state . . . . . . . . . . . : media disconnected    connection-specific dns suffix  . :    description . . . . . . . . . . . : microsoft isatap adapter #5    physical address. . . . . . . . . : 00-00-00-00-00-00-00-e0    dhcp enabled. . . . . . . . . . . : no    autoconfiguration enabled . . . . : yes

the challenge in getting "just 1 value" mess comes relationship between inetaddress.getlocalhost().gethostaddress() , network interfaces themselves. consider slight expanded version of initial program (using cool iterableenumeration utility class):

public static void main(string[] args) throws unknownhostexception, socketexception {   system.out.println("current ip address : " + inetaddress.getlocalhost().gethostaddress());    for(networkinterface network : iterableenumeration.make(networkinterface.getnetworkinterfaces())) {     byte[] mac = network.gethardwareaddress();     if(mac != null) {       system.out.print("current mac address : ");       stringbuilder sb = new stringbuilder();       (int = 0; < mac.length; i++) {         sb.append(string.format("%02x%s", mac[i], (i < mac.length - 1) ? "-" : ""));       }       system.out.println(sb.tostring());       //bound inetaddress interface       for(inetaddress address : iterableenumeration.make(network.getinetaddresses())) {         system.out.println("\tbound to:"+address.gethostaddress());       }     }   } }

if run on computer see current ip address correlates 1 adapter mac address of hardware interface sees it's self different ip address. maybe can filter out virtual addresses or find way utilize available addresses.


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