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Getting MAC Address of more than one NIC

Posted on 2003-11-13
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Last Modified: 2010-04-05
I want to make my application to get the MAC Address of all of the NIC Adapters on the computer. If the computer has two or three or more NIC Adapter, get the MAC Address of each one. This question is for an expert. Who ever get´s it right, I´ll increase the points.
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Question by:si0347429
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by:arjanh
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by:gmayo
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Unfortunately not reliable on 95 or 98 (see http://msdn.microsoft.com/library/default.asp?url=/library/en-us/netbios/netbios_1l82.asp). Also relies on netbios being installed, which is not always the case.

Have a look at http://community.borland.com/article/0,1410,26040,00.html - ignore the first one as it is the same as above. Look at the 3rd one, SNMP, which appears to be the only reliable method. Only problem: C++.

Geoff M.
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by:Ferruccio Accalai
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In addition to Geoff post (that is the right way) at this point: 'Only problem: C++.'
Fortunatelly Project Jedi gives lot of solutions for Delphi developers too...so you can get the API SNMP.h translation for Delphi here ftp://delphi-jedi.org/api/snmp.zip (also example included) and look at the above Article for Delphi (french language but most useful than the C++ one) at http://www.iglooduhack.com/delphi_adresse_mac.php

F68 ;-)
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by:JDuncan
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This is a great routine for doing everything you want networks/adapters/and mac addresses.

do a search on yahoo for tcpmon12.zip . it was written by
Dirk Claessens  <dirkCL@pandora.be>  and uses tcp/ip to enumerate all network resources and information including mac addresses.

If you want to use netbios to do the same using netbios then search for getmacad.zip on yahoo
    written by Vlad Sharnin  vladshar@ufanet.ru  

I don't have the original sites for the above but I can email the files if you have trouble finding them.

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by:si0347429
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Hey JDuncan I searched for tcpmon12.zip and i didn´t find it. Can you send it to me please. My e-mail is "si0347429@univale.br"
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by:JDuncan
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my yahoo account keeps rejecting you email address - is it correct?
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by:JDuncan
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Yopu can upload the file from :-

http://81.137.231.48/upload/tcpmon.zip
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by:si0347429
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Hey JDuncan do you know if it´s really possible to know which MAC is from what IP Address ? Because it shows it. But i´m no sure if it´s really possible. What do you think ???
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by:JDuncan
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Not sure I understand your question.

The same ethernet address(machine) can be bound to multiple network adapters
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by:si0347429
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First I would like to thank you for the tcpmon file. What i´m trying to ask is. Each NIC has it´s own MAC address and IP. Can I trust  on the infomation tha it´s telling me which is for example: the NIC´s IP Address is 100.100.1.10 and it´s MAC Address is 00-01-29-52-04-A4.
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JDuncan earned 300 total points
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Yes you can . The mac address comes from the network card's flash rom and is setup by the
manufacturer. You can also tell the manufacturer and model of the card from the mac address.
The ip address comes from windows  and is bound to the network card.

On normal pc's the only way for the card to be wrong is if someone re programs its flash .

I believe some PDA's have a mac address which can be setup by software.

The information is coming off the machines network card. Also if you try to get the mac address of a remote machine over a network via TCOP/IP this uses the wake on lan facility inside the network card. I don't think its possible using older cards . You then have to resort to netbios calls for these.
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by:si0347429
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JDuncan,
  Thank you. It was exactly what I needed man. I jus changed some things to do what I need. You helped me alot. Do you know if there´s anything like this one, but instead of getting the MAC, get the Video Card. I increased more 50 points for you.
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by:JDuncan
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Thanks, can you set the answer as accepted.

I think you can enumerater all system resources , i'll have a look

Jim Duncan
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Author Comment

by:si0347429
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Thanx.
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by:JDuncan
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I found this , its not much it only gives you the monitor sizes.

Thes is a function EnumDisplayMonitors somewhere which may give more info.
The function EnumMonitors is more fore system monitors like print servioces etc.


 uses multimon;

  myMonitor : TMonitor;
  monInfo : PMonitorInfo;
begin
    new(monInfo);
    i:=Screen.MonitorCount;
    for i:=0 to Screen.MonitorCount-1 do begin
      myMonitor:=Screen.Monitors[i];
      GetMonitorInfo(myMonitor.Handle,monInfo);
      Showmessage(inttostr(monInfo.cbSize));
      Showmessage(inttostr(monInfo.rcWork.Right));
    end;
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