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NETWORK ENGINEERING TOOL

Subnet & Wildcard Mask Calculator.

Calculate IPv4 network details, subnet masks, Cisco wildcard masks, host ranges, broadcast addresses and RFC classifications from a CIDR network.

← Network Toolkit

INPUT

Enter an IPv4 network

Enter an IPv4 address with CIDR notation. The calculation automatically identifies the network boundary.

Example: 10.20.30.0/24

NETWORK ENGINEERING

Subnet mask vs. wildcard mask

A subnet mask identifies which portion of an IPv4 address represents the network and which portion represents hosts.

A wildcard mask is the inverse of the subnet mask. It is commonly used in Cisco IOS configurations, access-control lists and OSPF network statements.

Subnet Mask Identifies the network and host portions of an IPv4 address.
Wildcard Mask Inverse of the subnet mask, commonly used in Cisco networking configurations.
RFC Classification Identifies common IPv4 address ranges and their associated RFC references.
⚠ Responsible Use

This tool is intended for network engineering, education, network administration and authorized troubleshooting.

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