If you configure firewall rules, then you need to allow/block a range of IP addresses.
One way to specify a range of IP address is to use IP address / CIDR suffix (e.g. 22.214.171.124/32)
The CIDR suffix can be confusing. So here is a quick reference table:
|CIDR||Effective IP Range||Total addresses|
|126.96.36.199/8||188.8.131.52 to 184.108.40.206||16,777,216|
|220.127.116.11./16||69.208,0.0 to 18.104.22.168||65,536|
|22.214.171.124/24||126.96.36.199 to 188.8.131.52||256|