that is an odd one.

i appears that all of the incoming IP addresses are reserved for private networks, so if i have this right, that network address should only be on the inside of a network and the IP coming to you should include the IP of the router or proxy that it is going through. routers dont use reserved IP addresses so they are pretty much null on the internet. the similar addresses that you are getting may be a router or proxy that these addresses are coming from. so whatever is coming to you, it may be coming from the inside of another LAN.