I'm trying to reverse map a block of IP using PTR record to some special name so their usage can be easily reflected by a simple nslookup.

For example, here's a nslookup result:

# nslookup 172.17.201.101
Server:         10.253.33.1
Address:        10.253.33.1#53

101.201.17.172.in-addr.arpa     name = for.internal.use.only.

And I learned that I can add PTR record for a /24 block by using $GENERATE directive

$GENERATE 0-254    $.201.17.172    PTR    for.internal.use.only.

So here's the question:

1. Am I doing right exposing infomation of IP address by adding PTR record? Any better idea?
2. If the question above is YES, then how to add PTR record for a /16 IP range? I know I can write 255 lines of $GENTERATE directive but any better solution?