Creating bogus response for a particular subnet

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Hello group

I'm currently working on a small project that needs a Bind v9 to return the  
same IP address for all requested domains. The catch is that the server 
only needs to do this for xx.xx.xx.xx/xx but not for yy.yy.yy.yy/yy. I know 
this can be done with views to separate the two subnets, but I'm not quite 
sure how to create the bogus response.

Any hints for how to do it?

Regards,
Lars Christensen