How to specify IP Address Range with CIDR suffix

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. 69.208.10.89/32)

The CIDR suffix can be confusing.  So here is a quick reference table:

CIDR Effective IP Range Total addresses
69.0.0.0/8 69.0.0.0 to 69.255.255.255 16,777,216
69.208.0.0./16 69.208,0.0 to 69.208.255.255 65,536
69.208.10.0/24 69.208.10.0 to 69.208.10.255 256
69.208.10.89/32 69.208.10.89 1

Technical Reference:

https://www.mediawiki.org/wiki/Help:Range_blocks

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