IP / CIDR Calculator
Calculate network details from an IP address or CIDR notation. Shows network, netmask, broadcast, host range, and total hosts.
Input
IP or CIDR
Output
Subnet details
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FAQ
- What formats are accepted?
- IPv4: 192.168.0.0/24. IPv6: 2001:db8::/32. Bare IPs are treated as /32 (v4) or /128 (v6).
- Why are total hosts different from usable hosts?
- The network address and broadcast address are reserved, so usable hosts = total hosts − 2 for IPv4. IPv6 doesn't reserve broadcast addresses, so all hosts are usable.
- Is my data uploaded anywhere?
- No. All calculation happens locally in your browser.