“Take it from me, you don't want to host /l/.”
– Christopher Poole¹⁾

not4chan was a bulletin board, hosted by “Saber”,²⁾³⁾ that housed 4chan's controversial boards from November 5, 2004 to July 23, 2006.⁴⁾⁵⁾ Despite its name, they were using 4chan's database and servers,⁶⁾⁷⁾ and didn't even bother to reset the post count after the alleged move.

Due to financial problems, 4chan silently removed their “Lolikon” (/l/) and “Shota/Male” (/sm/) boards around October 31, 2004,⁸⁾ then moved it to “not4chan.org” on November 5, 2004 under “Saber” (!Z.KBbHRpyU).⁹⁾ Much evidence reveals that it simply shared the database, especially since the post numbers wasn't reset, and it had the same moderator tools.¹⁰⁾¹¹⁾ Oddly enough, they never picked the “Guro” (/g/) board up.

Supposedly, it had strict moderation, among the constant morality debates,¹²⁾¹³⁾ and the final announcement about the website mentions the creation of a “Straight Shota” (/ss/) board on April 7, 2006.¹⁴⁾ However, the website died around July 23, 2006,¹⁵⁾¹⁶⁾ during the Adam Walsh Act scare.¹⁷⁾¹⁸⁾ Naturally, people brought the matter up at the Otakon 2006 panel on August 5, 2006.¹⁹⁾

• /l/58701 (2004-12-06) - “Mr. Sage”. A random post, showing the 'correct' way to use sage.
• /l/66666 (2005-01-07) - The “Dash Billions” GET thread.
• /l/75459 (2005-02-02) - The “Noh Bahdi” thread, also preserved within a World4ch thread.²⁰⁾
• /l/90906 (2005-04-18) - The “NOT PEDOPHILES ANONYMOUS” thread.

• /l/ - Lolikon
• /rl/ - Request/Loli²¹⁾²²⁾
• /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,²³⁾ but it struggled, died, and it was last seen with three boards.²⁴⁾ The website later turned into a redirect to “not4chanserver.org”, set up by “Lime Coke” using Thorn on January 1, 2007,²⁵⁾ 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.²⁶⁾ Curiously, this iteration became a J-List affiliate.²⁷⁾ After a few years, they switched to Kusaba X on February 19, 2010,²⁸⁾ then they vanished around December 1, 2011 as GoDaddy dropped them,²⁹⁾ the same host that dropped “4chan.net”.³⁰⁾

• The website had a green theme, in contrast to 4chan's yellow theme and Burichan's blue theme.
  • If you weren't around back then, you might've mistook it for an archived post.
• There was an old “not4chan Grab” extension for Mozilla Firefox and its final version, v1.14, was published on July 11, 2008. There's also the 4chan Grab fork, but it hasn't been updated since 2014, and people started using alternative extensions like DownThemAll after a certain point.³¹⁾

• 4chan - The point of origin, obviously.
• Gurochan - A popular alternative for the then-deleted 'guro' boards.

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