#17 way to divide long list of IP addresses

[Matt Wirges]

When I try to scan a class B of IP addresses the range is divided into single
IP addresses that are inserterted singularly into the db. Every time I reload
the page to insert a subset of them it takes a long time for the page to
reload.

The IP ranges should be split into individual IP addresses for scanning
purposes but not displayed (only still showing the range).