used this, been quite happy with this little tool.
tho keep in mind it will only work so long as the other node exists on a default port, else it becomes a lot more difficult to track down. (atleast by conventional means, stuff like packet sniffing)
port scanning is nice and simple…
i think there is a site for it today also… i should have the link … somewhere 
haven’t tried this out yet, as i already know there is someone on my subnet and if he has more nodes now it’s just going to annoy me, so i’m just going to not look lol…