Tip of the day: Channel mode +f is a powerful anti-flood feature. It is also slightly complex. Enable it in your most important channels, and consider setting a default in set::modes-on-join.

CIDR

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UnrealIRCd supports the CIDR notation when allowing/disallowing IP's. This can be used in bans, allow blocks, oper::mask, etc. etc. If you prefer to use CIDR, you can use it.

An example of CIDR would be 127.0.0.0/8 which matches 127.0.0.0 through 127.255.255.255. In this example we could just as easily have written 127.*.

For more information see Wikipedia - CIDR.