Syntax: ACCESS ADD mask
        ACCESS DEL mask
        ACCESS LIST
Modifies or displays the access list for your nick.  This is the list of addresses which will be automatically recognized by NickServ as allowed to use the nick.  If you want to use the nick from a different address, you need to send an IDENTIFY command to make NickServ recognize you.
Examples:

    ACCESS ADD anyone@*.bepeg.com
        Allows access to user anyone from any machine in
        the bepeg.com domain.

    ACCESS DEL anyone@*.bepeg.com
        Reverses the previous command.

    ACCESS LIST
        Displays the current access list.