sometimes I try and do a ping on the Unix system I have access to.. this is what it returned.

ICMP Host Unreachable from gateway **.**.***.**
for icmp from unix2 (***.***.**.*) to c-67-175-153-182.hsd1.il.comcast.net (67.175.153.182)

So it is a comcast.net account.. You could prob contact Comcast and show then whatever proof you have and see if they can help you at all..

ETA using a few searches on Google I was able to trace it down to Springfield IL. So it looks likes you close...