Re: IRC?
There is no official Defcon IRC server or channel. I do know that many Defcon Groups create their own channels on various IRC network, but there is no single, official "Defcon channel" or IRC server.
If there were such a network, even with 5% of the attendees using it, there would likely be way too much noise for anything productive.
For Defcon Group IRC channels, they often follow the convention #dc[0-9]+ where [0-9]+ is an area-code, or country code+area-code/city-code.
Also, sometimes contests or events will spawn their own IRC channels as Defcon approaches. I've seen that happen a few times over the past few years.
Check with your local DCG to see if they have a channel and which IRC network they use.
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