Resurrecting a dead torrent tracker and finding 3M peers

> Is this legal?

Why wouldn't it be? You're not actually hosting a tracker in this case, only looking at incoming connections. And even if you do run a tracker, hard to make the case that the tracker itself is illega. Hosting something like opentrackr is like hosting a search engine, how they respond to legal takedown requests is where the crux is at, and whatever infra sits around the tracker, so police and courts can see/assume the intent. But trackers are pretty stupid coordination server software, would be crazy if they became illegal.

Is this legal isn’t a useful question. The better question is how likely are you to get sued? With civil lawsuits it doesn’t matter if it’s legal you can be sued and harassed by lawyers if you get on their radar.

I’m not sure if that’s true actually, you might get a takedown notice, but to sue, and maybe I’m wrong but you have to claim damages, all op has to do is not announce out?

IE he can see the peer pool but they don’t announce the peer list.

The RIAA doesn't have to sue to make OP's life miserable. They have enough lawyers on the payroll to drown him in perfectly legal demand letters. Go one step further and assume the demand letters are harassment - what's OP going to do, sue the RIAA?