DB<1> x Net::IP->new( "10.0.2.3-5" )
  empty array
                                                                                  
  DB<2> x Net::IP->new( "10.0.2.3-10.0.2.5" )
0  Net::IP=HASH(0x198db00)
   'binip' => 00001010000000000000001000000011
   'ip' => '10.0.2.3'
   'ipversion' => 4
   'is_prefix' => 0
   'last_bin' => 00001010000000000000001000000101
   'last_ip' => '10.0.2.5'