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+
+KNOCK %|<channel>
+
+Works only in some IRC networks (hybrid-like ircds).
+
+KNOCK is a feature that lets you request access to a channel they cannot join without an invite, a key or a raised limit.
+
+The following conditions must be met for KNOCK to work:
+
+ - You are not banned from the channel
+ - Channel is not secret (+s)
+ - You are not already on the channel
+ - Channel is invite only (+i), has a key (+k) or limit is full
+
+When successful KNOCK issued, it sends a notice to channel operators. Use of KNOCK is rate limited by server.