This is a quick python script that takes CSV cidr blocks from a file or STDIN and aggregates them.
Example.csv contains three prefixes:
10.1.0.0/24,
10.1.1.0/24,
10.1.2.0/24
agg.py uses the python fileinput module, so can either be give a file name as input or it can read from STDIN
./agg.py example.csv
10.1.0.0/23,
10.1.2.0/24
Input 3 lines
Output 2 lines
or from STDIN
cat example.csv | ./agg.py
10.1.0.0/23
10.1.2.0/24
Input 3 lines
Output 2 lines