Aiur ran one season from December 2020 until September of 2021 on the 1.16 Nether Update
The Endercraft Server is no longer running, however information on the past seasons are available below:
Endercraft Season 1 ran during 1.8 from September 2015 to December 2015
Endercraft Season 2 ran from December 2015 to December 2017 running on 1.8
Endercraft Season 3 ran from December 2017 to May 2019 running on 1.12.2
Endercraft Season 4 ran from May 2019 until October 2019 on the 1.14 Village and Pillage update
Endercraft Season 5 ran from October 2019 until June 2020 on the 1.15 Buzzy Bees update
Endercraft Season 6 ran from June 2020 until December 2020 on the 1.16 Nether Update