Thanks for the information on the MAC address.
When I poll "attached devices" on my router page (192.168.1.1 ) with the Ethernet shield attached I see the following:
192.168.1.6 Epson (my wireless network printer)
192.168.1.110 My-PC (my computer hard wired)
192.168.3 Android_followed by numbers (my wireless ... obviously ...tablet)
192.168.1.253 unknown (my phone)
Notice there is not an IP for the shield. How can I find an IP when it does not seem to exist?