How to get client domain name with asp

[cymy]

Hi all,
I need to get the domain name from my client that is attempting to my page.

i have try Request.ServerVariables("REMOTE_HOST") but i only able to get client ip address. I know that if my server enable anonymous authentication on IIS then i can only get ip address instead of domain name for this Request.ServerVariables ("REMOTE_HOST"). I have try a lot of other method but most of them is to get self server domain name, but what i want is to get client server domain name instead of mine.

I need to solve this issue as soon as possible, please help me on this,
Thank you very much!