U-18chan is an English furry bulletin board with a convoluted history that spans back to 2006 with Aurorachan's /fur/ board. They were technically founded by “Filthy” and “Jay” in June 2009 as an IB4F board, then became independent around December 2010.

In 2006, there used to be a “Furry” (/fur/) board on Aurorachan whose users kept raiding 4chan's /b/ board as anti-furry sentiments were still high. These activities led to “Serpentor” establishing the “AuroraFurries” chatroom on Xat to co-ordinate their raids better. It was hard limiting the community to one board, so the first independence attempt was made by “Jay” and used Kusaba. However, this didn't last long.¹⁾

They would turn to IB4F where “Filthy” and “Jay” (“AlienSloth Man”) set up FilthySlothChan in June 2009,²⁾ asked “Serpentor” to formally move Aurorachan's furry community there, then renamed to U-18chan on October 22, 2009³⁾ since they joked that their community evaded raids like a U-18 submarine. Aurorachan eventually closed their /fur/ board, essentially sealing the deal.

Interestingly, the administrators decided to register the “u18chan.com”, “u18chan.net”, and “u18chan.co.uk” domains on September 10, 2010,⁴⁾ then “Infinitus” was forced to shutter IB4F in late November 2010.⁵⁾ This forced U-18chan to become independent again on December 2, 2010, starting over with a new installation of Kusaba X and temporarily borrowed Krautchan's mascot, Heinrich, as he fit their U-18 theming.⁶⁾

Due to performance issues with base Kusaba X, “Jay” requested IB4F's fork from “Infinitus”, which was then modified and installed on July 28, 2011.⁷⁾ Around September 24, 2012, a power surge killed the hard drive hosting the servers, forcing them to salvage what was left and move to a new datacenter.⁸⁾ Since then, it has been going strong for over a decade.

• Furry Related
  • Furries [fur] (Index)
  • Furry Comics [c] (Index)
  • Gay Furries [gfur] (Index)
  • Gay Furry Comics [gc] (Index)
  • Intersex [i] (Index)
  • Request & Source [rs]
  • Animated [a] (Index)
  • Cute [cute]
• The Basement
  • Ponies [p] (Index)
  • Feral [f] (Index)
  • Cub [cub] (Index)
  • Gore [gore] (Index)
• General
  • Discussion [d]
  • Music [mu]
  • Wallpapers [w]
  • Video Games [v]
  • Weapons [k]
  • Lounge [lo]
  • Technology [tech]
  • Literature [lit]
• Misc
  • JayCoin [jc] - It's a parody cryptocurrency stuck on the concept stage.

^{Note: This list was retrieved on 2021-11-14. It may have changed since then.}

• If it's not obvious, the U-18chan staff has explicitly stated that they don't condone Nazi ideology and don't wish to “spread the hatred and prejudice associated” on April 18, 2017.⁹⁾
• Their current mascot is “Valkria”, a female sergal who technically wears a Schutzstaffel uniform, but is rarely drawn with clothes for obvious reasons. A special page can be found at /vlkyra/.
• U-18chan had a “Scalies” (/scale/) board, but it closed in 2017 and was deleted some time after.

• U-18chan - The front page of U-18chan.
  • @u18chan on Twitter - The official U-18chan account. It's mostly technical stuff.
• U-18chan on WikiFur