Looking for a unsigned 128bit Integer Datatype for the .net Framework [duplicate]

This question already has answers here: Closed 10 years ago.

Possible Duplicate:

Int开发者_如何学Go128 in .Net?

as I'm working on a tool which manages IP devices and I'd like to add IPv6 Support to it, I'm searching for a 128bit unsigned Integer .net Datatype to do basic IP related calculations (Subnetting, List all Hosts for a Subnet, ..)

It should support the standard arithmetic/logic methods.

Thank you :)

---

in this article the author describes and shows how to implement the Int128 datatype in .NET: http://www.informit.com/guides/content.aspx?g=dotnet&seqNum=636

also please search here in SO before posting :)

Int128 in .Net?