| s<br>(secret) | This channel will not appear on channel lists or WHO or WHOIS output unless you are on it. |
| S<br>(SSL-only) | Only users connected via SSL may join the channel while this mode is set. Users already in the channel are not affected. Keep in mind that this also blocks all webchat users, as they are not marked as connected via SSL. |
| t<br>(ops topic) | Only channel operators may set the channel topic. |
+| u<br>(unfiltered) | Receive messages that are filtered server side by freenode based on content, usually spam. Set +u if you want the channel to receive these messages. Also see the corresponding user mode. |
| z<br>(reduced moderation) | The effects of +b, +q, and +m are relaxed. For each message, if that message would normally be blocked by one of these modes, it is instead sent to channel operators (+o). |
# Restricted channel modes
| i<br>(invisible) | Hides you from global WHO/WHOIS by normal users, and shows only shared channels in /WHOIS output. |
| Q<br>(disable forwarding) | Prevents channel forwards from affecting you. If a channel's modes prevent you from joining, you will receive the relevant error message regardless of any forwards. |
| R<br>(block unidentified) | Ignores private messages from users who are not identified with services. |
+| u<br>(unfiltered) | Receive messages that are filtered server side by freenode based on content, usually spam. Set +u if you want to receive these messages. Also see the corresponding channel mode. |
| w<br>(see wallops) | Subscribes you to /wallops messages from freenode staff. Used infrequently to highlight interesting announcements from the FOSS community. You will receive important network announcements irrespective of this setting. |
| Z<br>(connected securely) | Set automatically by the network when you connect via SSL/TLS. |