Hi, Plinio!
You can use service provided by http://vbnet.mvps.org/.
It's easy, because this service returns the only row of text - your outer IP:

Try the following code:

oIE=CREATEOBJECT("InternetExplorer.Application")
oIE.Navigate("http://vbnet.mvps.org/resources/tools/getpublicip.shtml")
oDoc=oIE.Document.ActiveElement
? oDoc.innerText

Have a nice day!

>Is there any class to obtain my public ip address like www.showmyip.do does?