Identify the class and default subnet mask of the IP address 2I7.65.10.7 in classfi:laddressing.

To identify the class and default subnet mask of the IP address 2I7.65.10.7 in classful addressing, we need to examine the first octet of the IP address.

The first octet of the given IP address is 2I7. However, this is not a valid octet as it contains the letter "I" instead of a number. In classful addressing, the first octet determines the class of the IP address.

Since the given IP address is not valid, we cannot determine its class or default subnet mask. Please provide a valid IP address for further analysis.