I was looking through some IIS logs and came across some client and ISP IP addresses that I didn't recognize. I tried to look them up in ICANN put only found that they are part of a block of IPs owned by Comcast. I wanted to narrow down the Geographic location of the consumer of my web service ie the client IP.
10.12.109.5
10.11.109.49
10.11.109.48
10.11.109.45