Not4chan was a short-lived bulletin board that was set up by “Saber” on November 5, 2004, linked to 4chan to some degree,¹⁾²⁾ but it suddenly vanished around July 2006, presumably due to an understandable³⁾⁴⁾ loss of interest or fears of upcoming legislation.

Due to financial problems, 4chan removed their “Lolikon” (/l/) and “Shota/Male” (/sm/) boards on October 31, 2004, shortly after the Anime USA 2004 panel.⁵⁾ These boards were then moved to the “not4chan.org” domain on November 5, 2004, run by “Saber”, but shared its database with 4chan.⁶⁾ Curiously, the “Guro” (/g/) board was also removed, but it wasn't picked up by Not4chan, presumably because Gurochan exists.

There isn't much known about Not4chan, aside from its strict moderation and constant morality debates that surrounded it.⁷⁾⁸⁾ The only evidence it existed was a 4chan announcement on “Straight Shota” (/ss/) being added on April 7, 2006⁹⁾ and a number of World4ch threads.^10)11)12) Eventually, Not4chan disappeared around July 2006,^13)14)15)16) either due to declining interest¹⁷⁾ or the Adam Walsh Act.¹⁸⁾

Most evidence of these boards existing can usually be found on Google in old forum posts or the board was listed as a source in old image gallery post. Oddly enough, no archives of the boards or threads exist.

• /l/ - Lolikon
• /rl/ - Request/Loli¹⁹⁾²⁰⁾
• /sm/ - Shota/Male
• /ss/ - Straight Shota
• /tl/ - Torrents/Loli

An unofficial successor emerged at “not4chan.us” on August 30, 2006, set up by “narunet” using Wakaba,²¹⁾ but it struggled, died, and was last seen with three boards.²²⁾ The website later turned into a redirect to “not4chanserver.org”, set up by “Lime Coke” using Thorn on January 1, 2007,²³⁾ but this iteration did not last long either, and it presumably died around February 25, 2007.

Many months later, a new unofficial successor emerged at “notfourchan.net”, supposedly re-established by “narunet” and “crazymonkey” on July 6, 2007, using Seirissa.²⁴⁾ Curiously, this iteration became a J-List affiliate.²⁵⁾ After a few years, they switched to Kusaba X on February 19, 2010,²⁶⁾ then they vanished around December 1, 2011 as GoDaddy dropped them,²⁷⁾ the same host that dropped “4chan.net”.²⁸⁾

• There was once the “not4chan Grab Extension”, a Firefox extension²⁹⁾ for downloading images, developed by “Random Translator” who released the final version, v1.14, on July 11, 2008. It was later forked into 4chan Grab, but the extension is now over a decade old.
• Recently, the original “not4chan.org” domain was recently picked up on December 13, 2023, but it is mostly being used as an archive for 4chan and 789chan of the /cwc/–/cow/ lineage.

• 4chan
  • World4ch
• Burichan
• Gurochan

• not4chan [Archive] - The only archive of not4chan, which is just a redirect.