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Home / Tools / Advanced Subnet Calculator (CIDR)
Advanced Subnet Calculator (CIDR) Icon

Advanced Subnet Calculator (CIDR)

Calculate IPv4/IPv6 subnets and CIDR ranges instantly.

Network Address
Broadcast Address
Usable Host Range
Total Usable Hosts
Subnet Mask
Wildcard Mask
IP Class

What is an IP Subnet Calculator?

A Subnet Calculator is a crucial tool for network administrators, IT professionals, and students to quickly perform IP subnet math. It takes an IP address and a routing prefix (CIDR) or subnet mask, and instantly calculates the network boundaries.

Why is Subnetting Important?

Subnetting divides a large network into smaller, more manageable sub-networks. This improves network performance by reducing broadcast traffic, enhances security by isolating groups of hosts, and conserves IP addresses by allocating only the necessary amount of hosts per department.

How to Use This Tool

1
Enter IP Address: Type a valid IPv4 address into the input field (e.g., 192.168.1.10).
2
Enter Mask/CIDR: Provide the subnet mask in either decimal format (255.255.255.0) or CIDR notation (/24).
3
Instant Results: The table will instantly update with the Network Address, Broadcast Address, Usable Host Range, Total Hosts, and Wildcard Mask.

100% Offline and Private

For security professionals, entering sensitive network topologies into a web tool can be a risk. This Subnet Calculator is built using client-side JavaScript. It runs 100% in your browser without sending any IP addresses or network configurations to a server. Your data remains strictly on your device.

Frequently Asked Questions

What is a subnet mask?

A subnet mask divides an IP address into a network address and a host address, allowing a single large network to be divided into smaller sub-networks (subnets).

What is CIDR notation?

CIDR (Classless Inter-Domain Routing) notation is a compact representation of an IP address and its associated routing prefix. For example, /24 means the first 24 bits of the IP address are used for the network.

Does this calculator support IPv6?

Yes! This subnet calculator natively supports both IPv4 and IPv6 addresses and mask calculations.

Is my IP address or network data sent to a server?

No. This tool runs 100% offline in your browser. None of your calculations are ever sent over the internet, ensuring total privacy.

How do I find the usable host range?

The usable host range excludes the Network Address (the first IP in the subnet) and the Broadcast Address (the last IP in the subnet). Our tool calculates and displays this range automatically.