CIDR / IP Calculator
Enter an IPv4 address with CIDR prefix (e.g. 10.0.0.0/8) and get the complete subnet breakdown: network address, subnet mask, broadcast address, first and last usable host, total hosts, and wildcard mask. Also converts between CIDR prefix length and dotted-decimal subnet masks.
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Common Use Cases
- Plan cloud VPC CIDR blocks
- Calculate usable hosts in a subnet
- Debug network segmentation issues
- Verify firewall rule IP ranges
Frequently Asked Questions
What does /24 mean in CIDR notation?
/24 means the first 24 bits of the IP address are the network portion, leaving 8 bits for hosts. That gives 2^8 = 256 addresses, with 254 usable hosts (the network address and broadcast address are reserved).
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Tool Info
CategorynetworkAI EnhancementNoData StorageZero retention