MAC number from Query Analyzer

-----RETURN MAC------------
------updated-------------- 
---------------------------


Create procedure proc_MAC_number

AS

DECLARE @first char(2),
@second char(2),
@third char(2),
@fourth char(2), 
@fifth char(2), 
@sixth char(2) 

SELECT @first = substring(net_address,1,2),
  @second = substring(net_address,3,2),
  @third = substring(net_address,5,2),
  @fourth = substring(net_address,7,2),
  @fifth = substring(net_address,9,2),
  @sixth = substring(net_address,11,2)
FROM master..sysprocesses
WHERE spid = @@SPID

print @first + '-' + @second + '-' + @third + '-' + @fourth + '-' + @fifth + '-' + @sixth 

----Execution

EXEC proc_MAC_number