CIDR Segment Calculator
Calculate IPv4 and IPv6 CIDR network, broadcast, and address counts locally.
Runs in your browserEvery computation happens in your browser — your data never leaves this device.
CIDR address
CIDR result
Network boundaries and address count.
Enter CIDR to see the result
What this tool does
- Check subnet boundaries
- Plan IPv4 and IPv6 address space
Example
Input
2001:db8::1/64
Output
2001:db8::/64 network: 2001:db8:: broadcast: 2001:db8::ffff:ffff:ffff:ffff count: 18446744073709551616
Frequently asked questions
Is IPv6 supported?
Standard IPv6 CIDR is supported.
How is the network address determined?
The prefix length is used to normalize the network boundary.
What does the address count include?
The result shows the full number of addresses in the CIDR.
Keywords：CIDRIPv4IPv6