What The Hack was an outdoor hacker conference held in Liempde, Netherlands between the 28th and 31st of July, 2005.
Over 2000 hackers visited the event to participate in an exchange on several technical, social and philosophical matters of importance to the technically inclined community.
Visitors from all over the world arrived at the Camp Ground including groups of such diversity as OpenBSD developers, the German Chaos Computer Club, members of the 2600: The Hacker Quarterly hackergroup, and numerous smaller groups and organisations in addition.
Several smaller events were embedded in or inspired by this event like the Hacktrain, which was planned to travel there, as well as the local radio station, and the smaller Police village which featured specialists from their IT Department, as well as interested government parties.
Peg DHCP (RFC 2322) was used during the event to allocate IP addresses.