CIDR Calculator
Calculate IPv4 network, broadcast, host ranges, masks, and binary representation from CIDR notation.
Enter an IPv4 network in CIDR notation (e.g. 10.10.10.0/27).
What is CIDR Calculator?
CIDR calculation helps you convert prefix lengths into masks and ranges when designing or documenting IP networks.
How it works
Provide a CIDR block and PacketWizard derives the addressing details you need for planning, ACLs, and documentation.
Common issues
Overlapping ranges
When merging sites or VPCs, verify new CIDR blocks do not overlap existing routes before deployment.
Frequently asked questions
Is CIDR only for IPv4?
No. CIDR applies to IPv6 as well, though host-count intuition differs. Use the IPv6 subnet calculator for v6 planning.
Related tools
Continue with these related PacketWizard tools for adjacent diagnostics.
IPv4 Subnet CalculatorCalculate IPv4 subnets from an address and CIDR or subnet mask with classification and mask conversion.IPv6 Subnet CalculatorExpand, compress, and analyze IPv6 subnets with prefix information and address classification.What Is My IPSee the public IPv4 or IPv6 address internet services observe for your current browser session.