[thelist] FW: MAC Addresses/Physical Address!

Mark Anderson marke.anderson at btinternet.com
Wed Oct 2 17:17:13 CDT 2002

Thanks Judah,
I'll look into that I was aware that Physical Addresses aren't sent over the
network. What I aim to do is get the address and use it on the local machine
in a query against the central database. Initially of course that address
would need to be sent to the central database BUT that's a different story!


-----Original Message-----
From: thelist-admin at lists.evolt.org
[mailto:thelist-admin at lists.evolt.org]On Behalf Of Judah McAuley
Sent: 02 October 2002 23:07
To: thelist at lists.evolt.org
Subject: Re: [thelist] FW: MAC Addresses/Physical Address!

Mark Anderson wrote:
> I'm trying to obtain programmatically the MAC Addresses/Physical Address
> ADSL modems! I have tried using the code I have for mac addresses on
> ethernet cards (from Microsoft's msdn) but it looks like ADSL modems don't
> have a mac address...
> I have a client that wants to be able to uniquely identify a whole series
> pc's they have which are spread around the country and connected to the
> internet and check a unique unalterable id against a central database so
> they can load appropriate updates etc. Basically it's to be part of a
> licensing system!
> Can anyone point me in the right direction (need to do it in VB6)

Physical Addresses aren't sent over the network.  That info is at the
wrong network level (Physical layer versus the Transport layer).  You
might be able see a physical address for a DSL modem on a local network,
but that information is not included in the information that is passed
out over the Internet.  When the packet gets to the router on the far
end of the request, the destination router looks up the MAC address on
its local network using ARP to match an IP address to a MAC address.
For more info check out: http://www.nwfusion.com/news/tech/0201tech.html

Bottom line:  you might be able to do a MAC address lookup on a local
network, but you won't be able to do one remotely.


For unsubscribe and other options, including
the Tip Harvester and archive of thelist go to:
http://lists.evolt.org Workers of the Web, evolt !

More information about the thelist mailing list