I am not sure what exactly you're looking for, but if you want to get the IP address of a user visiting your ASP.NET site, you can use something like the following:

Dim strClientIP As String
strClientIP = Request.UserHostAddress()
Response.Write(strClientIP)

See this posting for some more info:
http://www.vikramlakhotia.com/How_to_get_User%e2%80%99s_IP_Address_in_ASPNET.aspx

Hope this helps,