Subnet Calculator - IP CIDR Network Calculator Free

How to Use the Subnet Calculator

1. Enter an IP address — e.g. 192.168.1.0
2. Enter CIDR prefix — e.g. 24 (or use netmask format like 255.255.255.0)
3. View results instantly — network address, broadcast, usable range, total hosts, and wildcard mask

Perfect for network engineers, system administrators, CCTV installers, and IT professionals planning IP networks for surveillance systems.

Features

• Instant calculation — updates as you type
• CIDR notation — supports prefixes from /0 to /32
• Complete details — network address, broadcast, first/last usable IP, total hosts
• Subnet mask — both dotted decimal and CIDR
• Wildcard mask — useful for ACLs and routing protocols