Producing a Reverse in-addr.arpa zone file

[Al Sparks]

I went and downloaded dns-utl because dns-rev, which is supposed to be
able to produce a reverse zone based on a forward looking zone.

When I loaded a file into it, I got lots of errors and no output.

For example, in my SOA, I use units like 24H instead of 86400.  It
doesn't like that.

It also complains about things like capitalizations in zone files.

So maybe I could easily set up a simple perl script that would take
care of those types of problems.  But still...

So I was wondering, are there other programs out there that will
generate a reverse look up file?
     === Al