Люди у кавонить есть прога на Delphi 7??

http://forum.sources.ru/index.php?

Тут смотри и спрашивай

по ARP-таблице

www . delphisources . ru / pages / programs / network - scan - os - info . html

Lanscope

Функции для ипа и мака

Function GetLocalIP : string;
type
TaPInAddr = array [0..10] of PInAddr;
PaPInAddr = ^TaPInAddr;
var
phe : PHostEnt;
pptr : PaPInAddr;
Buffer : array [0..63] of char;
I : Integer;
GInitData : TWSADATA;
Begin
WSAStartup($101, GInitData);
Result := '';
GetHostName(Buffer, SizeOf(Buffer));
phe :=GetHostByName(buffer);
if phe = nil then Exit;
pptr := PaPInAddr(Phe^.h_addr_list);
// Phe^.h_addr_list - должен содержать IPдля всех интерфейсов.
I := 0;
while pptr^ <> nil do begin
// приводим их по очерёдности к нормальному виду
Result := Result + StrPas(inet_ntoa(pptr^^));
Inc(I);
end;
WSACleanup;
End;

function GetMACAddress: string;
var
AdapterList: TLanaEnum;
NCB: TNCB;
begin
FillChar(NCB, SizeOf(NCB), 0);
NCB.ncb_command := Char(NCBENUM);
NCB.ncb_buffer := @AdapterList;
NCB.ncb_length := SizeOf(AdapterList);
Netbios(@NCB);
if Byte(AdapterList.length) > 0 then
Result := GetAdapterInfo(AdapterList.lana[0])
else
Result := 'mac not found';
end;
function GetAdapterInfo(Lana: Char): String;
var
Adapter: TAdapterStatus;
NCB: TNCB;
begin
FillChar(NCB, SizeOf(NCB), 0);
NCB.ncb_command := Char(NCBRESET);
NCB.ncb_lana_num := Lana;
if Netbios(@NCB) <> Char(NRC_GOODRET) then
begin
Result := 'mac not found';
Exit;
end;
FillChar(NCB, SizeOf(NCB), 0);
NCB.ncb_command := Char(NCBASTAT);
NCB.ncb_lana_num := Lana;
NCB.ncb_callname := '*';
FillChar(Adapter, SizeOf(Adapter), 0);
NCB.ncb_buffer := @Adapter;
NCB.ncb_length := SizeOf(Adapter);
if Netbios(@NCB) <> Char(NRC_GOODRET) then
begin
Result := 'mac not found';
Exit;
end;
Result :=
IntToHex(Byte(Adapter.adapter_address[0]), 2) + '-' +
IntToHex(Byte(Adapter.adapter_address[1]), 2) + '-' +
IntToHex(Byte(Adapter.adapter_address[2]), 2) + '-' +
IntToHex(Byte(Adapter.adapter_address[3]), 2) + '-' +
IntToHex(Byte(Adapter.adapter_address[4]), 2) + '-' +
IntToHex(Byte(Adapter.adapter_address[5]), 2);
end;