Modes that can be set on channels.
Modes that can be set on channels that have parameters. If non-empty, it is assumed that the modes in channelModes do not have parameters.
Server name. Typically a valid hostname, but not necessarily.
Modes that can be set on servers.
Modes that can be set on servers that have parameters. If non-empty, it is assumed that the modes in serverModes do not have parameters.
Modes that can be set on users.
Modes that can be set on users that have parameters. If non-empty, it is assumed that the modes in userModes do not have parameters.
Version string of the software run by server.
004 RPL_MYINFO response.