This command will allow you to create a list of nicknames that cannot be used by anyone that is not an operator on the server or that doesn't have the password. To connect with a password you must either use
/as security nonick add *Serv password foo Services Abuse
You can use wildcards when creating your nickname mask. If you use Web* then any nickname that starts with web will be prevented from being used.
This command deletes a specified mask form the list of prohibited nicknames.
/as security nonick del WebBot
The mask must match exactly to a mask that was placed using the SECURITY NONICK ADD command. A wider mask will not delete masks that are contained in that mask.
Lists all prohibited nicknames.
/as security nonick list