Subnet Calculator – Fast & Accurate IP Subnetting
The Subnet Calculator is a powerful online tool that helps IT professionals and network administrators calculate subnet masks, CIDR notations, and usable IP address ranges. Whether you're setting up a small office network or designing a large infrastructure, this calculator simplifies the complex process of IP subnetting.
What is a Subnet Calculator?
A subnet calculator is a utility that allows you to divide an IP network into smaller sub-networks (subnets). It helps calculate:
- Network address
- Broadcast address
- Number of hosts per subnet
- Usable IP address range
- CIDR (Classless Inter-Domain Routing)
How to Use the Subnet Calculator
- Enter an IP address (e.g., 192.168.1.0).
- Select the subnet mask or CIDR (e.g., /24).
- Click "Calculate" to get network details.
Why Use a Subnet Calculator?
- Quickly break down networks into manageable subnets
- Improve IP address management
- Enhance security by segmenting networks
- Optimize routing efficiency
Common CIDR Notation Reference Table
| CIDR | Subnet Mask | Hosts |
|---|---|---|
| /30 | 255.255.255.252 | 2 |
| /29 | 255.255.255.248 | 6 |
| /28 | 255.255.255.240 | 14 |
| /27 | 255.255.255.224 | 30 |
| /26 | 255.255.255.192 | 62 |
| /24 | 255.255.255.0 | 254 |
| /16 | 255.255.0.0 | 65,534 |
Use Cases
- Assigning IPs to departments or VLANs
- Designing enterprise or cloud network structures
- Creating isolated testing environments
Benefits of Our Subnet Calculator
- Instant results with detailed breakdown
- Supports both IP and CIDR input
- Mobile-friendly and accessible on any device
- Reduces configuration errors
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FAQs about the Subnet Calculator
1. What is a subnet?
A subnet is a segmented piece of a larger IP network. It allows better IP address management and security.
2. What does CIDR mean?
CIDR (Classless Inter-Domain Routing) is a method for allocating IP addresses and routing that allows more efficient use of address space.
3. What is the difference between subnet mask and CIDR?
Subnet mask is a 32-bit number that segments IP addresses. CIDR is a shorthand representation of the subnet mask (e.g., /24).
4. How many usable IPs are in a /26 subnet?
A /26 subnet has 64 total IPs, with 62 usable IP addresses (excluding network and broadcast).
5. Is this calculator compatible with IPv6?
This version is designed for IPv4. An IPv6 subnet calculator is coming soon.