def do303(self, irc, msg):
        if not msg.args[1]:
            nick = self._getNick(irc.network)
            if nick:
                self._sendNick(irc, nick)
This is returned by the ISON command.
dataset/ETHPy150Open ProgVal/Limnoria/plugins/NickCapture/plugin.py/NickCapture.do303