[MPru]

А можно ли через

TIdIcmpClient *Client;
Client = new TIdIcmpClient(Form);
AnsiString Host="192.168.1.";
for(int i=1;i<=255;i++)
{
Client->Host=Host+IntToStr(i);
Client->Ping();
if(Client->ReplyStatus.BytesReceived>1)
{
//----------------------
}

}