A knock is issued to request an invitation to a channel that you normally would not be allowed to enter. This is usually done only on channels which are +i, or invite only. You may however attempt to use the command on a channel from which you are banned. When you issue a knock, channel operators will be informed that you are requesting entry to the channel. You can issue at most one knock every five minutes. You cannot issue a knock command to a channel that is set to mode +K.
To issue a knock to #channel, use this command: