You want to block the "reserved purpose" ips in each range also, as in:
But the above entry, I can not find why I included it in my notes, it may have been a UK only something.
But, back on topic, For instance:
NetRange: 18.104.22.168 - 22.214.171.124
NetType: Direct Assignment
The tool twobob used to convert CIDR must have been "protecting" the top and bottom two "special purpose" IP addresses of each range.
I am going to walk out onto the thinest of the ice and say those are the: "broadcast" and "anycast" addresses for each range.