Getting the MAC Address for an Ethernet Adapter

You can use the Netbios function to get the Media Access Control (MAC) address for an ethernet adapter if your card is bound to NetBIOS. The following example uses the NCBASTAT command, providing an asterisk (*) as the name in the ncb_callname member of the NCB structure.

Note  The following code does not work reliably on Windows 95 or Windows 98.

#include <windows.h>
#include <wincon.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>

typedef struct _ASTAT_
{
    ADAPTER_STATUS adapt;
    NAME_BUFFER    NameBuff [30];
}ASTAT, * PASTAT;

ASTAT Adapter;

void main (void)
{
    NCB ncb;
    UCHAR uRetCode;
    char NetName[50];

    memset( &ncb, 0, sizeof(ncb) );
    ncb.ncb_command = NCBRESET;
    ncb.ncb_lana_num = 0;

    uRetCode = Netbios( &ncb );
    printf( "The NCBRESET return code is: 0x%x \n", uRetCode );

    memset( &ncb, 0, sizeof(ncb) );
    ncb.ncb_command = NCBASTAT;
    ncb.ncb_lana_num = 0;

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

    uRetCode = Netbios( &ncb );
    printf( "The NCBASTAT return code is: 0x%x \n", uRetCode );
    if ( uRetCode == 0 )
    {
        printf( "The Ethernet Number is: %02x%02x%02x%02x%02x%02x\n",
                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] );
    }
}