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External Ip

Posted on 2006-07-18
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Last Modified: 2011-10-03
Hi.

How can i get my external ip ??
(A question asked a million times BUT i only get local ip from other PAQ solutions)

I am behind a router !...
Is there a way to get it except visiting a page and grab the ip string?

I found a promising PAQ here :
http://www.experts-exchange.com/Programming/Programming_Languages/Delphi/Q_21408046.html

Everything works except "FCurrentIpAddress".
I get a memory read/write error when i try to use it.

Thanks in advance.
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Question by:CodedK
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10 Comments
 
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Accepted Solution

by:
calinutz earned 250 total points
ID: 17128708
function TForm1.checkRealIP(Sender:TOBject):string;
var
 sx:string;
 i:integer;
begin
  sx:=IdHTTP1.Get('http://www.whatismyip.org/');
  Application.ProcessMessages;
  i:=1;
  while sx[i] in ['0'..'9','.'] do
    inc(i);
  delete(sx,i,length(sx));
  checkRealIP:=sx;
  idHTTP1.Disconnect;
end;



....
Edit1.Text:=CheckRealIP(self);
....
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Expert Comment

by:calinutz
ID: 17128712
No other ways of detecting the real IP otherwise... None that I know of anyways...

Regards
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Author Comment

by:CodedK
ID: 17128721
Hi calinutz.

Thanks but i have that code ... :/
I allready said : "except visiting a page and grab the ip string"

Chack that link i gave... It can get every other info.
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Expert Comment

by:2266180
ID: 17128821
codedk, there is absolutly no way of getting the real IP address except getting it from an external source (like a website or dedicated server). there are tons of ways to "turn" a LAN ip into an external one, and most of them use software, and not hardware, so there is no standard. the best and easiest way is to use one of the showmyip pages, just as calinutz suggested.
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Author Comment

by:CodedK
ID: 17128863
:)

Hi ciuly.
Ok, i guess i knew that (or saw that coming) , but one last thing...
Since i've used katka source (link above) to get all the other info (Hardware oriented solution),
can anyone make the FCurrentIpAddress work ? (Just out of curiocity coz every other info worked).
Maybe its my hardware the problem thats why i'm asking.
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Expert Comment

by:TheRealLoki
ID: 17129235
actually, certain routers will let you query them and will tell you your external ip (via telnet etc)
try
telnet (router ip address)
and see if you can find a command to show you the external ip your isp has assigned you.
be careful in there though :-)
some specific ISPs have a webpage also, but you do not want this approach
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Expert Comment

by:Russell Libby
ID: 17131427

GetAdaptersInfo can NOT be used to resolve your external IP address, but there is a way using iphlpapi and the function GetBestRoute.

It basically amounts to starting with the local address and giving it a dest address; something like "www.google.com". This will fill in a block giving you the next forward address. Then its a matter of calling GetBestRoute again until the address is no longer in the private address range of 192.x.x.x / 10.x.x.x. (then you need to add 1 to the final byte of x.x.x.x).

I can provide an example shortly if you would find it helpful

Russell
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Author Comment

by:CodedK
ID: 17131449
I'd like that Russell.
Thanks :)
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Expert Comment

by:Russell Libby
ID: 17133203

Never mind...
The problem is not that it doesn't work, its just that the routing table information is for the *outbound* direction. The inbound direction (how others see your IP), and the route path that they would use to get to you is not always the same as the outbound path. For your problem, the most reliable (and generic) solution is going to be connecting to one of the numerous 'whats my ip' sites and parsing the IP address out.

Regards,
Russell
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Author Comment

by:CodedK
ID: 17134523
:) Ok thanks for all the suggestions.
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