[TOPX]

Para quien le sirva:
1) A continuación, el código original, publicado en Network infrastructure discovery - StackOverflow por [RRUZ]:

Código Delphi [-]
{$APPTYPE CONSOLE}

{$R *.res}

uses
  StrUtils, Windows, WinSock, SysUtils;

type
  PNetResourceArray = ^TNetResourceArray;
  TNetResourceArray = array[0..1023] of TNetResource;

function SendArp(DestIP,SrcIP: ULONG;pMacAddr: pointer;PhyAddrLen: pointer): DWord; 
  StdCall; external 'iphlpapi.dll' name 'SendARP';

function GetIPAddress(const HostName: AnsiString): AnsiString;
var
  HostEnt: PHostEnt;
  Host: AnsiString;
  SockAddr: TSockAddrIn;
begin
  Result := '';
  Host := HostName;
  if Host = '' then
  begin
    SetLength(Host, MAX_PATH);
    GetHostName(PAnsiChar(Host), MAX_PATH);
  end;
  HostEnt := GetHostByName(PAnsiChar(Host));
  if HostEnt <> nil then
  begin
    SockAddr.sin_addr.S_addr := Longint(PLongint(HostEnt^.h_addr_list^)^);
    Result := inet_ntoa(SockAddr.sin_addr);
  end;
end;

function GetMacAddr(const IPAddress: AnsiString; var ErrCode : DWORD): AnsiString;
var
 MacAddr    : Array[0..5] of Byte;
 DestIP     : ULONG;
 PhyAddrLen : ULONG;
begin
  Result    :='';
  ZeroMemory(@MacAddr,SizeOf(MacAddr));
  DestIP    :=inet_addr(PAnsiChar(IPAddress));
  PhyAddrLen:=SizeOf(MacAddr);
  ErrCode   :=SendArp(DestIP,0,@MacAddr,@PhyAddrLen);
  if ErrCode = S_OK then
   Result:=AnsiString(Format('%2.2x-%2.2x-%2.2x-%2.2x-%2.2x-%2.2x',
    [MacAddr[0], MacAddr[1],MacAddr[2], MacAddr[3], MacAddr[4], MacAddr[5]]));
end;

function ParseRemoteName(Const lpRemoteName : string) : string;
begin
  Result:=lpRemoteName;
  if StartsStr('\\', lpRemoteName) and (Length(lpRemoteName)>2) and 
  (LastDelimiter('\', lpRemoteName)>2) then
   Result:=Copy(lpRemoteName, 3, PosEx('\', lpRemoteName,3)-3)
  else
  if StartsStr('\\', lpRemoteName) and (Length(lpRemoteName)>2) and 
  (LastDelimiter('\', lpRemoteName)=2) then
   Result:=Copy(lpRemoteName, 3, length(lpRemoteName));
end;

function CreateNetResourceList(ResourceType: DWord;
                              NetResource: PNetResource;
                              out Entries: DWord;
                              out List: PNetResourceArray): Boolean;
var
  EnumHandle: THandle;
  BufSize: DWord;
  Res: DWord;
begin
  Result := False;
  List := Nil;
  Entries := 0;
  if WNetOpenEnum(RESOURCE_GLOBALNET, ResourceType, 0, NetResource, EnumHandle) = NO_ERROR then
  begin
    try
      BufSize := $4000;  // 16 kByte
      GetMem(List, BufSize);
      try
        repeat
          Entries := DWord(-1);
          FillChar(List^, BufSize, 0);
          Res := WNetEnumResource(EnumHandle, Entries, List, BufSize);
          if Res = ERROR_MORE_DATA then
          begin
            ReAllocMem(List, BufSize);
          end;
        until Res <> ERROR_MORE_DATA;

        Result := Res = NO_ERROR;
        if not Result then
        begin
          FreeMem(List);
          List := Nil;
          Entries := 0;
        end;
      except
        FreeMem(List);
        raise;
      end;
    finally
      WNetCloseEnum(EnumHandle);
    end;
  end;
end;

procedure ScanNetworkResources(ResourceType, DisplayType: DWord);

  procedure ScanLevel(NetResource: PNetResource);
  var
    Entries: DWord;
    NetResourceList: PNetResourceArray;
    i: Integer;
    IPAddress, MacAddress : AnsiString;
    ErrCode : DWORD;
  begin
    if CreateNetResourceList(ResourceType, NetResource, Entries, NetResourceList) then try
      for i := 0 to Integer(Entries) - 1 do
      begin
        if (DisplayType = RESOURCEDISPLAYTYPE_GENERIC) or
          (NetResourceList[i].dwDisplayType = DisplayType) then
          begin
            IPAddress   :=GetIPAddress(ParseRemoteName(AnsiString(NetResourceList[i].lpRemoteName)));
            MacAddress  :=GetMacAddr(IPAddress, ErrCode);
            Writeln(Format('Remote Name %s Ip %s MAC %s',
              [NetResourceList[i].lpRemoteName, IPAddress, MacAddress]));
          end;
        if (NetResourceList[i].dwUsage and RESOURCEUSAGE_CONTAINER) <> 0 then
          ScanLevel(@NetResourceList[i]);
      end;
    finally
      FreeMem(NetResourceList);
    end;
  end;
begin
  ScanLevel(Nil);
end;

var
  WSAData: TWSAData;
begin
  try
   if WSAStartup($0101, WSAData)=0 then
   try
     ScanNetworkResources(RESOURCETYPE_ANY, RESOURCEDISPLAYTYPE_SERVER);
     Writeln('Done');
   finally
     WSACleanup;
   end;
  except
    on E:Exception do
      Writeln(E.Classname, ': ', E.Message);
  end;
  Readln;
end.

2) Y adjunto a este mensaje

• captura de pantalla de la aplicación de consola y
• el código fuente adaptado (improvisadamente) para una aplicación visual hecha en Delphi 5.

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