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Computer Evidence: Collection and Preservation, Second Edition by Christopher L. T. Brown

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Using the Cisco Wildcard Mask

When entering subnets into a Cisco router, the IOS expects a single dotted decimal notation entry to represent the subnet range. The following examples show how to find the Cisco subnet entry for two different network subnets.

Cisco wildcard mask for an entire subnet:

255.255.255.255
– 255.255.192.0
________________
0. 0. 63.255

Cisco wildcard mask to match range:

100.1.16.0 – 100.1.31.255
100.1.31.255
– 100.1.16.0
________________
0.0.15.255

Take the broadcast and subtract from the network.

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