Connected up addresses

I have a couple up address on my network that I can’t figure out who or what they are. They show up as 192.168.1.219 and 192.168.1.243 and 100.107.12.233 is dns lookup of first, and 100.107.13.141 for the second.Can anyone help me please? I don’t know enough to get any forward progress. I have more questions but I’ll stick to this first