IP Class | Subnet Mask |
Class A | 255.0.0.0 |
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Class B | 255.255.0.0 |
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Class C | 255.255.255.0 |
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Subnet mask settings other than those listed above add significance to the interpretation of bits in the IP address. The bits of the subnet mask correspond directly to the bits of the IP address. Any bit an a subnet mask that is to correspond to a net ID bit in the IP address must be set to 1.
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