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CIDR Calculator
Calculate CIDR network information including subnet mask, network address, broadcast address, and usable IP ranges.Network Planning Insights
CIDR notation is essential for modern network design, allowing efficient IP address allocation and subnet planning.📖 Usage Guide
Step 1
Enter an IP address and CIDR notation (e.g., 192.168.1.0/24).
Step 2
View calculated network information including subnet details.
Step 3
Copy results for network configuration and documentation.
✨ Features
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Calculate complete CIDR network information.
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Display subnet mask in decimal and binary formats.
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Show usable IP address ranges and totals.
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Support for all CIDR notation ranges (0-32).
🔬Mini Tutorial
CIDR Calculation PrincipleThis tool calculates CIDR (Classless Inter-Domain Routing) network information using bitwise operations on IP addresses. It determines the network address, broadcast address, subnet mask, and usable IP ranges based on the CIDR notation. The calculator handles IPv4 addresses and provides both decimal and binary representations for comprehensive network analysis.
Subnet Division BasicsCIDR allows more flexible IP address allocation through Variable Length Subnet Masking (VLSM). The number of network bits determines the size of the network, and the number of host bits determines the number of available hosts in each network. For example, /24 means the first 24 bits are used for network identification and the last 8 bits are used for host identification.
Bitwise CalculationCIDR calculation uses bitwise operations to determine network addresses and broadcast addresses. The network address is obtained by performing a bitwise AND operation between the IP address and the subnet mask, and the broadcast address is obtained by setting all host bits of the network address to 1. These calculations ensure address uniqueness and correctness.
Practical Application ScenariosCIDR is widely used in modern network design, including enterprise network planning, cloud computing environments, container networks, VLAN design, etc. It helps network administrators optimize IP address usage, improve network efficiency, and support complex network topologies.