range_start
range_end
location
net_start = (range_start / 65536 * 65536)
net_end = (range_end / 65536 * 65536)
(0..( (net_end-net_start)/65536 )).each{ |i|
  net = (net_start + i * 65536).to_s
  @db.query("insert into blocks (range_start, range_end, location, net) values (" +
             range_start +  "," + range_end + "," + location + "," + net + ")")
}