I was running some tests when I discovered an IP on a third subnet as shown in the following nmap output:
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Starting Nmap 5.21 ( http://nmap.org ) at 2013-01-03 16:13 EST
Nmap scan report for 192.168.55.1
Host is up (0.017s latency).
Not shown: 932 closed ports, 65 filtered ports
PORT STATE SERVICE
1723/tcp open pptp
1863/tcp open msnp
5190/tcp open aol
Replacing the modem/router with a different model gave the same results.
I'm mystified as to how a private IP address can appear on the WAN side of a modem.
Any suggestions?