01
Convert CIDR notation into a complete IPv4 range
Enter an IPv4 address with a prefix length and calculate the normalized network, broadcast address, mask, wildcard mask, and usable host range.
Network Broadcast Host range
IPv4 subnet planning tool
IPv4 CIDR Calculator Calculate subnet ranges and host capacity
Convert IPv4 CIDR notation into a complete network range. Calculate the subnet mask, wildcard mask, network address, broadcast address, usable host range, address capacity, binary details, and optional smaller subnet splits directly in your browser.
/0–/32prefix support
Binarymask details
Subnet splitchild range preview
CIDR and subnet settings
IPv4 CIDR Calculate an IPv4 CIDR block
Use this IPv4 subnet calculator to convert CIDR notation into a full network range. It shows the subnet mask, wildcard mask, network address, broadcast address, and usable host range.
Example profile A common private LAN with 254 usable hosts.
Current calculation Host IP input is normalized to the correct network range after calculation.
192.168.1.0/24→IP rangeNo CIDR range calculated yet
Enter a CIDR block like 192.168.1.0/24 and press Calculate CIDR Range. The result will include subnet mask, wildcard mask, network address, broadcast address, usable host range, and optional subnet split details.
What does an IPv4 CIDR calculator show?
An IPv4 CIDR calculator converts an address and prefix length into the exact network boundaries represented by that block. It helps you understand masks, address capacity, host ranges, and how larger networks can be divided into smaller subnets.
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Understand subnet masks and wildcard masks
See the dotted-decimal subnet mask used for routing and the inverse wildcard mask commonly used in access control and network configuration.
Subnet mask Wildcard Routing
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Preview smaller subnets inside a CIDR block
Choose a larger target prefix to divide the current block into smaller networks and inspect each child subnet range before deployment.
Subnet split VLSM planning Address allocation
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Inspect binary IPv4 network details
Display binary masks, normalized network bits, and broadcast bits to understand exactly how the prefix separates network and host portions.
Binary mask Network bits Host bits
Network use cases Network planning Firewall rules Cloud networks
Plan networks, firewall rules, cloud subnets, and IP allowlists
CIDR ranges appear in routing tables, proxy allowlists, cloud networks, VPN rules, firewalls, access-control policies, and infrastructure documentation. Calculate the complete range before applying a block to production.
Plan address ranges before assigning hosts
Calculate network boundaries, host capacity, and smaller child subnets before allocating addresses to offices, services, or infrastructure.
Validate allowlists, denylists, and ACL ranges
Confirm the exact network and wildcard mask represented by a CIDR block before adding it to a firewall, router, or access-control policy.
Design VPC and application subnets
Preview how a larger IPv4 network can be divided into smaller public, private, database, worker, and load-balancer subnets.
IPv4 CIDR calculator FAQ
Quick answers about CIDR notation, network normalization, subnet masks, wildcard masks, broadcasts, host ranges, subnet splitting, /31 networks, and /32 host routes.
CIDR notation combines an IPv4 address with a prefix length. For example, /24 means the first 24 bits identify the network and the remaining 8 bits identify addresses inside that network.
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