It was UltraHDCLUB, sadly its not around anymore.

BakaBT was the first one 10 years back, only back than I didn't even know that it was a private tracker.

Tvchaos, Torrentday, myWoot and The Box. All 10 years +- ago.

My first private tracker was and still is tracker.czech-server.com, very old czech tracker. I'm a member since 2007!
And before tracker era i was a direct connect user for many years.

my first private tracker was bitsoup. it was good. i upload like 7 TB and then they changed to gamepeers and started to charge $10 subscription for torrents. so i moved to torrentday.

mine is IDE

My first one was Btuga, an old and closed portuguese tracker.

My First Private Tracker is Elite Torrents

Mine was Demonoid if i remember correctly.

BakaBT was my first but lost my account and ratio because I didn't have internet for over a year... BakaBT was then my second private tracker