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For finding an open ssh port on your network
for i in {1,10,20,30,40}; do sudo nmap 192.168.$i.* -p 22 --open; done(Change the 1, 10 etc... to reflect what subnets you have)
For ports in use on localhost:
lsof -Pn +M -i4also this, which I use to track down ports that are open & blocking something else :
netstat -anlp | grep -w "Proto\|LISTEN"
NotThamesWater
aggi
Tried a few different machines and some are definitely on the same subnet.
Sometimes run into issues with things that don't like the multiple APs and SSIDs on the network but haven't had that issue with a pi before.