Dr. PortScan is a tool for the automatic analysis of port scans in large and complex network infrastructures. The differences between successive scans of a network can be sent as reports at regular intervals to predefined admins. It uses port scans generated with nmap by default.
geoipgen is an IP network tool for generating geotargeted lists of IP addresses using MaxMind's GeoLite Country database. It can randomly enumerate all IP addresses or a specified number of IP addresses in a particular country or a list of countries. For example, to get all IPs for Japan in a random order, use "geoipgen jp". For a sample of 10,000 IPs from Australia and New Zealand, use "geoipgen -n 10000 au nz".