CIDR / IP Calculator

Calculate IPv4 network details from CIDR notation such as 192.168.1.10/24.

Features

• Find the network address and broadcast address
• Calculate first and last usable host addresses
• Convert CIDR prefixes into subnet masks and wildcard masks
• Show total and usable address counts
• Display IP address and subnet mask values in binary
• Identify private IPv4 ranges

Common uses

• Plan private network ranges
• Check subnet boundaries before firewall or routing changes
• Convert CIDR notation into subnet mask and wildcard mask values
• Verify whether an IPv4 address belongs to a private range

The calculator runs locally in the browser and does not send IP data to a server.