How do I get the caller's IP address in a WebMethod?

Question

How do I get the caller's IP address in a WebMethod?

[WebMethod]
public void Foo()
{
    // HttpRequest... ? - Not giving me any options through intellisense...
}

using C# and ASP.NET

Answer 1

HttpContext.Current.Request.UserHostAddress is what you want.

Answer 2

Just a caution. IP addresses can't be used to uniquely identify clients. NAT Firewalls and corporate proxies are everywhere, and hide many users behind a single IP.