So, the UltimateMinecraft one was a server my brother played on. I went on and griefed his house, in which he got pretty mad at me about, and reported me. That happened sometime ealier this year. ObsidianCraft, an admin wasn't my biggest fan, so when I was wrongly kicked I came back on, yelled at him and got banned. That was also earlier this year, if not around December last year. The other one's were probably from going around and trolling with my friends. My bet is, they all occurred sometime in the past year, December-ish, if not earlier this year.