Ну в винде можно сделать так:
Цитата:
To determine the MAC address of a remote device:
Open the MS-DOS prompt (From the Run... command, type "CMD" and press Enter).
Ping a remote device that you want to find the MAC address (for example: PING 192.168.0.1).
Type "ARP -A", and press Enter.
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Цитата:
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\WINDOWS>arp -a
Interface: 192.168.1.100 --- 0x10004
Internet Address Physical Address Type
192.168.1.1 aa-fb-c8-34-da-7a dynamic
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Соответственно, то же самое можно реализовать на Delphi.