CHANNEL PROPERTY: USERSPERIP
Usage: PROP <#channel> USERSPERIP [<limit>]
The USERSPERIP property lets you set a maximum number of users that may share an IP in a channel. A value of 2-3 is usually a good setting. However, in the case of an event that attracts users from a certain netcafe or a similar shared connection, you probably want to raise or disable this value.
/prop #Philadelphia usersperip
/prop #Philadelphia usersperip 3