Microsoft KB Archive/118623

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HOWTO: Get the MAC Address for an Ethernet Adapter

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Q118623

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The information in this article applies to:


 * Microsoft Win32 Software Development Kit (SDK), used with:
 * Microsoft Windows NT Server versions 3.1, 3.5, 3.51, 4.0
 * Microsoft Windows NT Workstation versions 3.1, 3.5, 3.51, 4.0
 * the operating system: Microsoft Windows 2000
 * Microsoft Windows 98
 * Microsoft Windows 95

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SUMMARY
This article demonstrates how to get the Media Access Control (MAC) address for an ethernet adapter programmatically by using NetBIOS, if your card is bound to NetBIOS.

MORE INFORMATION
To get the Media Access Control (MAC) address for an ethernet adapter programmatically, use the Netbios NCBASTAT command and provide a "*" as the name in the NCB.ncb_CallName field. This is demonstrated in the sample code below.

For computers with multiple network adapters you need to enumerate the LANA numbers and perform the NCBASTAT command on each. Even when you have a single network adapter, it is a good idea to enumerate valid LANA numbers first and perform the NCBASTAT on one of the valid LANA numbers. It is considered bad programming to hardcode the LANA number to 0.

In addition, other hardware and software may be assigned their own MAC addresses. For example, a modem can have a MAC address. Also, a RAS client or server can install "dummy" network adapters that correspond to a dialup or serial connection. Normally, these MAC addresses are randomly generated. If an adapter status is called on a LANA that corresponds to one of these adapters when no connection is present, Netbios returns error 0x34 (NRC_ENVNOTDEF) even if a reset was previously performed.

With the NetBEUI and IPX transports, the same information can be obtained at a command prompt by using:

  net config workstation The ID given is the MAC address.

The following code enumerates all LANA numbers, performs a reset (NCBREST), and an adapter status (NCBASTAT).

Sample Code
  #include    #include    #include    #include    #include 

typedef struct _ASTAT_ {

ADAPTER_STATUS adapt; NAME_BUFFER   NameBuff [30];

}ASTAT, * PASTAT;

ASTAT Adapter;

void main (void) {     NCB Ncb; UCHAR uRetCode; char NetName[50]; LANA_ENUM  lenum; int     i;

memset( &Ncb, 0, sizeof(Ncb) ); Ncb.ncb_command = NCBENUM; Ncb.ncb_buffer = (UCHAR *)&lenum; Ncb.ncb_length = sizeof(lenum); uRetCode = Netbios( &Ncb ); printf( "The NCBENUM return code is: 0x%x \n", uRetCode );

for(i=0; i < lenum.length ;i++) {         memset( &Ncb, 0, sizeof(Ncb) ); Ncb.ncb_command = NCBRESET; Ncb.ncb_lana_num = lenum.lana[i];

uRetCode = Netbios( &Ncb ); printf( "The NCBRESET on LANA %d return code is: 0x%x \n",                 lenum.lana[i], uRetCode );

memset( &Ncb, 0, sizeof (Ncb) ); Ncb.ncb_command = NCBASTAT; Ncb.ncb_lana_num = lenum.lana[i];

strcpy( Ncb.ncb_callname, "*               " ); Ncb.ncb_buffer = (char *) &Adapter; Ncb.ncb_length = sizeof(Adapter);

uRetCode = Netbios( &Ncb ); printf( "The NCBASTAT on LANA %d return code is: 0x%x \n",                 lenum.lana[i], uRetCode ); if ( uRetCode == 0 ) {            printf( "The Ethernet Number on LANA %d is:                     %02x%02x%02x%02x%02x%02x\n",            lenum.lana[i],                  Adapter.adapt.adapter_address[0],                  Adapter.adapt.adapter_address[1],                  Adapter.adapt.adapter_address[2],                  Adapter.adapt.adapter_address[3],                  Adapter.adapt.adapter_address[4],                  Adapter.adapt.adapter_address[5] ); }      }

} Additional query words:

Keywords : kbnetwork kbAPI kbNetBIOS kbOSWinNT310 kbOSWinNT350 kbOSWinNT351 kbSDKPlatform kbOSWin95 kbGrpDSNet

Issue type : kbhowto

Technology : kbWin32SDKSearch kbAudDeveloper kbSDKSearch kbWin32sSearch