csv_lookup.py will add reverse dns information to a any supplied csv file. provide an input file, output file, and the column that contains the IPs to be looked up. prior to dooing the lookups, csv_lookup.py will grab a list of distince IPs to lessen required resouces. csv_lookup.py will add a column to the right of the IP column ad insert reverse DNS information. rob22202@gmail.com, rob22202 on github