Opentracker is the most widely used BitTorrent tracker software:
Installation:
apt install cvs build-essential libowfat-dev cvs -d :pserver:anoncvs@cvs.fefe.de:/cvs co opentracker cd opentracker && make ./opentracker -p 6969
Opentracker runs as a standalone UDP/TCP tracker. Configure IP address binding, port, and access controls in the configuration file. Default port 6969 (UDP and TCP).
Capacity: Opentracker handles millions of peers efficiently. A 2 vCPU, 2GB RAM VPS handles 100,000+ concurrent peers without performance issues. Memory usage is approximately 100MB per 100,000 active torrents.