IP Subnet Calculator
Calculate network details from an IP address and subnet mask/CIDR.
Results:
Enter IP and Mask/CIDR to see results.
How to Use the IP Subnet Calculator:
- 1 Enter an IP Address (e.g., 192.168.1.100).
- 2 Enter the Subnet Mask (e.g., 255.255.255.0) or CIDR notation (e.g., /24).
- 3 Click the "Calculate Subnet" button.
- 4 The network address, broadcast address, usable host range, and number of hosts will be displayed.
What is IP Subnetting?
IP subnetting is the process of dividing a large IP network into smaller, more manageable sub-networks, or "subnets." This is a fundamental concept in computer networking used to improve performance, security, and administration.
Understanding the Results:
- Network Address: The first IP address in the subnet. It represents the network itself and cannot be assigned to a host.
- Broadcast Address: The last IP address in the subnet. A packet sent to this address is delivered to all hosts within that subnet.
- Usable Host Range: The range of IP addresses between the Network and Broadcast addresses that can be assigned to individual devices (computers, printers, etc.).
- Total Usable Hosts: The total number of available IP addresses for devices in the subnet.
- CIDR Notation: Classless Inter-Domain Routing (e.g., /24) is a compact way to represent the subnet mask. The number indicates how many bits are used for the network portion of the address.
This calculator helps network administrators and students quickly determine the properties of a subnet, which is essential for network design and troubleshooting.