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The IP addresses that have a default subnet mask of 255.255.0.0 belong to specific classes of IP addresses. The subnet mask of 255.255.0.0 corresponds to Class B addresses. Class B addresses range from 128.0.0.0 to 191.255.255.255.

In this context, the address 191.168.2.15 falls within the Class B range, making it a valid choice with its default subnet mask of 255.255.0.0. Therefore, this IP address is correctly identified as having that default mask.

To further identify other valid addresses with a default subnet mask of 255.255.0.0, additional addresses from Class B must be examined. The other addresses listed, such as 129.0.0.1 and 168.16.5.1, are also valid Class B addresses and thus share the same default subnet mask.

It's worth noting that 192.168.1.1 is a Class C address, which typically uses a default subnet mask of 255.255.255.0. This distinction is important because it sets apart the Class C addresses from the Class B ones, confirming that only 191