LIST %|[-yes] [<channel>]

Lists the channel names. Trying to list all the channel names usually causes you to be disconnected from the server with the reason "Excess flood", as usually all 40000 channels form together and server naively attempts to send you them.

Thus, on IRCNet, you should rather use service ALIS (Advanced Listing Service), which will allow you to query for channel with specific name, topic, mode or usercount. Type /SQUERY ALIS HELP to get more info about it.

See also: SQUERY