420chan was an anonymous imageboard founded on 20 April 2005[3][4][note 1] by hacker[5] and freelance web developer[6] Aubrey Cottle.

[7] Discussion on the site was primarily focused around recreational drug use and wrestling, with other boards related to topics including humor and academia.

[8] While in its early history it was primarily known for hosting a board known as /i/,[note 2][note 3][2] then used by the hacker collective Anonymous[8][9] to stage "invasions" against individuals and web platforms such as Habbo Hotel,[10] and Hal Turner.

[8] The modern incarnation of the website was primarily known for hosting discussions about psychoactive drugs legal and illegal.

On 20 April 2023, the domain was sold to Fredrick Brennan for $4,200 in Ethereum, and a temporary landing page went up.