/msg $C NOREGISTER <#channel|*Account> <duration> <reason>
With no arguments, lists the current do-not-register channels.
With arguments, adds a do-not-register channel (or account) with the specified reason.  In this case, the channel name may include * or ? wildcards.
The duration may be "0" to make it never expire; otherwise, the do-not-register entry will be automatically removed after $uduration$u.
$uSee Also:$u allowregister, dnrsearch, register, unregister