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The default subnet mask associated with Class A is 255.0.0.0. In IP addressing, Class A addresses are designated for large networks and are characterized by their leading bit pattern, which starts with a binary '0'. This means that Class A addresses range from 1.0.0.0 to 126.0.0.0.

The corresponding default subnet mask, 255.0.0.0, indicates that the first octet (the first 8 bits) is used for the network part of the address, while the remaining three octets can be used for host addresses within that network. This allows for a significantly higher number of hosts in Class A networks compared to Classes B and C.

Understanding subnet masks is crucial for network routing, as they help define what portion of the IP address refers to the network and what part refers to the individual host. In the context of Class A, utilizing the default mask of 255.0.0.0 facilitates networking in extensive organizations or locations with vast numbers of devices, ensuring efficient address allocation and management.