Title: How do I check if an IP Address exists or not?
This function uses the Indy Clients, and checks if a given IP Address is valid or not by Pinging that IP. If it receives anything back, it returns true, or else if it does not get a reply, it returns false.
CODE
unit IPVerify;
interface
uses
IdBaseComponent, IdComponent, IdRawBase, IdRawClient, IdIcmpClient,
Windows, Messages, Classes, SysUtils;
function IPExists(IPAddr: String): Bool;
implementation
function IPExists(IPAddr: String): Bool;
var
I: TIdIcmpClient;
Rec: Integer;
begin
Result:= False;
I:= TIdIcmpClient.Create(nil);
try
I.Host:= IPAddr;
I.Ping();
Sleep(2000);
Rec:= I.ReplyStatus.BytesReceived;
if Rec 0 then Result:= True else Result:= False;
finally
I.Free;
end;
end;
end.