USER MODE p

Usage: UMODE +|-p
Usage: MODE <nick> +|-p
p - CTCP block
This will prohibit others from sending you CTCP requests. You will see CTCPs that are sent to channels that you are in, but you won't reply to them. This mode is useful to prevent CTCP flooding or just annoying CTCPs. CTCPs are used to measure lag or gather information about someone, such as what client they are using. Operators can bypass this mode.
Privilege: user
Examples:
/mode jimmers +p
/umode +p