Class identifies the range of your IP address and the default subnet mask.
A class - 0 to 127 with default mask of 255.0.0.0
B class - 128 to 191 with default mask of 255.255.0.0
C class - 192 to 223 with default mask of 255.255.255.0
D class - 224 to 247 (not currently used)
E class - 248 to 255 (not currently used)
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