CIDR cleanup

[John Von Essen <john () essenz com>]

Sorry if this is slightly off-topic, but I am writing some code for a custom GeoDNS routemap. My starting data set is a 
raw list of /24 subnets, no prefix aggregation has been done. In other words, its the entire BGP routing table in /24 
prefixes - tagged by Geo region. Each region is its own txt file with a dump of /24’s. As a result, these lists are 
HUGE. I want to aggregate the prefixes as much as possible to create a smaller routemap.

So right now it looks like:

...
105.170.72.0/24 brs
105.170.73.0/24 brs
105.170.74.0/24 brs
105.170.75.0/24 brs
105.170.76.0/24 brs
105.170.77.0/24 brs
105.170.78.0/24 brs
105.170.79.0/24 brs
105.170.80.0/24 brs
105.170.81.0/24 brs
105.170.82.0/24 brs
105.170.83.0/24 brs
105.170.84.0/24 brs
…

and so on. Obviously, 105.170.72.0/24 thru 105.170.79.0/24 can be aggregated to 105.170.72.0/21 and so on. I normally 
use Perl, does anyone now if there is a perl module that will automatically do this prefix aggregation? I tried to 
write my code to do this, and its not trivial, just lookinh for a shortcurt. I did a breif glance at some CIDR related 
Perl cpan modules, and nothing has jumped out.

Thanks
John

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