classless ptr setup

[Jim Pazarena]

I have a full /24, which I would like to separate into two /25's, and
assign each half to two of my customers. The snag is that *I* maintain
the DNS for each of these customers.

Is it possible to create the classless setup within my system so that it
starts with the /24 but can assign the two classless /25's ?

If so, I am stumped on the setup. Any help would be appreciated.