IPv4 /8
cidr = 10.0.0.0/8
Result: 16,777,216 addresses (10.0.0.0 to 10.255.255.255)
CIDR Calculator
Enter CIDR notation (e.g. 192.168.1.0/24 or 2001:db8::/32) to calculate network, broadcast, host range, mask, and host count. Automatically detects IPv4 vs IPv6.
Enter your values and press Calculate — the result appears here.
Worked examples
IPv6 /32
cidr = 2001:db8::/32
Result: Prefix: 2001:db8::/32
Frequently asked questions
What does CIDR stand for?
Classless Inter-Domain Routing. It replaced the old classful addressing (Class A/B/C) with flexible prefix lengths.
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