Calculate IPv4 CIDR ranges, subnet masks, wildcard masks, host counts, network addresses, and membership checks locally.
Inspect network address, broadcast address, first host, last host, and prefix size.
Convert CIDR prefixes into subnet masks and wildcard masks.
Test whether another IPv4 address belongs to the selected range.
Copy binary network and mask representations for documentation.
Estimate usable host counts for regular subnets and edge prefixes.
All math happens locally and does not query external IP services.
This version focuses on IPv4 CIDR calculations. IPv6 can be added as a separate advanced network tool.
A wildcard mask is the inverse of the subnet mask and is commonly used in ACL and routing configuration.
The calculator labels common private IPv4 ranges such as 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16.