Tool for network summary analysis

Does anyone know of a linux command line tool that can take multiple subsets (in standard or slash notation) and provide a summary based on a requested output mask length. For example, lets say I wanted to summarize the following networks to the nearest /16:

10.1.1.0 255.255.255.0 10.1.10.0 255.255.254.0 10.1.50.1 255.255.255.255 10.2.1.10 255.255.252.0 

I would want the tool to output 10.1.0.0 255.255.255, and 10.2.0.0 255.255.0.0.

Thanks!