Subnet Calculator – IP Subnetting, CIDR & Network Addresses
Calculate subnets, network address, broadcast, usable hosts, subnet mask and CIDR notation instantly. 100% free · Instant results · Works in your browser.
Network Address
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Broadcast Address
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Subnet Mask
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CIDR Notation
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Usable Hosts per Subnet
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Total Subnets Possible
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Why Use This Subnet Calculator?
- Quickly calculate subnet ranges, network addresses, broadcast addresses, and usable IPs
- Convert between CIDR notation and subnet masks easily
- Plan and manage IP addressing for networks efficiently
- Eliminates manual subnetting errors and saves time
- Perfect for network engineers, IT professionals, and students learning networking
- Free, fast, and accessible on any device
How to Use Subnet Calculator (3 Easy Steps)
- Enter the IP address you want to subnet
- Provide the subnet mask or CIDR notation
- Click “Calculate” to see subnet ranges, network addresses, broadcast addresses, and number of usable IPs
Frequently Asked Questions (FAQ)
What is subnetting?
Subnetting is the process of dividing a larger network into smaller, manageable subnetworks (subnets) to improve network organization and efficiency.
What is CIDR notation?
CIDR (Classless Inter-Domain Routing) notation is a compact representation of an IP address and its subnet mask, e.g., 192.168.1.0/24.
Who should use this subnet calculator?
Network engineers, IT professionals, students, and anyone managing IP networks can use this tool to simplify subnet calculations.
Can this calculator handle both IPv4 and IPv6?
Yes, it can process IPv4 subnetting. For IPv6, additional calculation rules may apply.
How accurate are the calculations?
The calculator uses standard subnetting formulas to provide precise network addresses, broadcast addresses, and usable IP ranges.
Is this subnet calculator free to use?
Yes, it is completely free and requires no registration.