One of the PC's on my home net has the hostname '3770k', because that's the model of its CPU.
I usually type 'ssh 3' and hit tab to autocomplete the connection.
I just realised I now have two entries starting with a 3: my regular 3770k one and also 18.104.22.168.
It appears when I try ssh, scp and rsync. It traces to Ann Arbor, Michican. I'm in the UK and have never knowingly connected to a PC in Michigan.
Any idea what I've done? Is there a config file I might have accidentaly appended this address to? I've looked in ~/.ssh/config and it isn't there. I haven't accidentally created a file named after the IP. If I try to ping this mystery address I get no reply.
There's a colon after it if I autocomplete it with ssh, so my PC seems to think it's a network location.