That was my initial thinking, but there are no unknown devices connected to the router. What I suspect has happened is that I've been given a new IP some time within the last few days and the data on the site isn't exactly live.
There might also be something in how the data is collected and how Bittorrent works, so some else had this IP a few days back and there are still Bittorrent clients that are trying to connect and that might be what the site is seeing.
Bittorrent might also be much more popular than I expected, because almost every IP around mine seems to be torrenting something. But I think it's due to short leases on IPs because it seems unlikely to me that 8 out 10 is using Bittorrent.
