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