Asus RX3042H User Manual page 120

IP Address, Network Masks, and Subnets
Class A:
Class B:
Class C:
These are called default because they are used when a network is
initially configured, at which time it has no subnets.
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255.0.0.0
255.255.0.0
255.255.255.0
RX3042H User's Manual