Windows Failover Cluster - Different IP

Good Morning!

I need to create a WFC (Windows Failover Cluster) in my environment, because i will delivery to my client a AlwaysOn , But the problem begins when i need to assign a IP to the WFC….

I don't have more IP's in that range - 75.126.3.230, so i can assign a IP to the WFC. So what i can do is contract IP's in this ranges - 

75.126.18.184/30

75.126.83.48/29

75.126.83.56/29

So, how can i change the IP o WFC to one of this IP`s? I see the two excelents posts http://blogs.msdn.com/b/clustering/archive/2011/01/05/10112055.aspx and http://blogs.msdn.com/b/clustering/archive/2011/08/31/10204142.aspx

But i don't understand yet, i need to register the new IP on the DNS and after this add on WFC?

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