D-Link DSL-502T User Manual download pdf (Page 83)

DSL-502T ADSL Router User’s Guide

Subnet Mask

In the absence of subnetworks, standard TCP/IP addressing may be used by specifying subnet masks as shown

below.

IP Class Subnet Mask

Class A 255.0.0.0

Class B 255.255.0.0

Class C 255.255.255.0

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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D-Link DSL-502T User Manual Page 83