1. if it's who I think it is, we already know about him, he's a well known hacker.
2. while the settings include a server to connect to undernet with, the log you include shows him trying to connect to dal.net which is another irc network, you might want to notify them as well.
For future reference you can email this kind of thing to email@example.com
(if you want help fixing your server), and firstname.lastname@example.org
(will need your servers host to identify any registered usernames/channels they may have used).
I hope your server is ok.
- Errors fixed, Etherfast, this is a post not an email.