Often times we need to find a machine's MAC address so that we can setup DHCP reservations,
such as when installing a new server.

A>  You can use a two-step technique:
  1.  PING the machine's address and get a reply.
  2.  Run the ARP -a command against the IP address to get the MAC.
 
  Example:
  PING 192.168.50.2
  <wait for reply, and then...>
  arp -a 192.168.50.2
 
  responds with:
  U:\>arp -a 192.168.50.2
 
  Interface: 192.168.50.71 --- 0x10003
    Internet Address      Physical Address      Type
    192.168.50.2          00-11-85-d4-2a-6d     dynamic
 
 
B> You can use the GETMAC command instead
 
  > GETMAC /s <IPAddress> /v
 
  Example:
  getmac /s 192.168.50.2 /v will respond with:
  U:\>getmac /s 192.168.50.2 /v
 
  Connection Name Network Adapter Physical Address    Transport Name
  =============== =============== =================== ====================================================
  Server Local Ar HP NC7761 Gigab 00-11-85-D4-2A-6D   \Device\Tcpip_{B85F8DB3-496B-47E8-AE1A-FF3BEB640020}