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Wildcard Mask Calculator

Find Cisco wildcard masks for IPv4 ACLs and routing configuration.

Runs locally

Cisco-style wildcard masks for common IPv4 prefixes.

PrefixWildcard maskUsable hosts
/80.255.255.25516,777,214
/160.0.255.25565,534
/200.0.15.2554,094
/220.0.3.2551,022
/230.0.1.255510
/240.0.0.255254
/250.0.0.127126
/260.0.0.6362
/270.0.0.3130
/280.0.0.1514
/290.0.0.76
/300.0.0.32
/310.0.0.12
/320.0.0.01

Networking TOOL

Wildcard Mask Calculator

Find Cisco wildcard masks for IPv4 ACLs and routing configuration.

When to use this tool

Use wildcard masks when writing Cisco ACL, OSPF or route filtering rules.

Use it in three steps

  1. Select or enter a CIDR prefix to see the matching inverse mask.
  2. Review the calculated values against your environment and its requirements.
  3. Copy or document the result only after validating it for production use.

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