c – Only accept PM’s from channels you share with the user.
G – Censors incoming private messages of bad words.
I (uppercase i) – Hides users from showing other channels to other non-operators.
i – Invisible, can’t be seen in a /who from non-operators.
R – Prevents the receipt of private messages from non-registered users of NickServ.
S – Strips color coding from incoming private messages and notices.
w – Wallops, can receive server WALLOPS.
x – User’s host is masked. Setting this off will reveal your IP address and disable your virtual host if you one.
To set these modes on or off, use this command:
/mode yournick +wx
To turn them off, just replace the + (plus) with – (hyphen).