IP Subnet Calculator - FastToolsHQ

IP Address

Subnet Mask (CIDR)

Network Address

Broadcast Address

Usable Host Range

Total Usable Hosts

IP Class
Subnet Mask
Wildcard Mask
CIDR Notation
IP Type
Short / Binary ID
Binary Subnet Mask

All Possible Subnets (for this classful network)

Showing standard subnets if applicable

About Subnetting

Subnetting allows you to divide a network into smaller, more efficient sub-networks. This calculator helps network administrators determine the range of valid IP addresses for a given subnet mask.

What is Subnetting?

Subnetting is the practice of dividing a network into smaller, more manageable sub-networks. It improves network performance, security, and IP address management by creating logical boundaries within a larger network.

Common Use Cases

Network Design

Plan IP address allocation for enterprise networks.

Security Isolation

Segment networks to contain security breaches.

Router Configuration

Configure routing tables and firewall rules.

Host Capacity

Determine how many devices a subnet can support.

How It Works

Enter IP Address

Input an IPv4 address like 192.168.1.1.

Select Subnet Mask

Choose a CIDR notation from /1 to /32.

Calculate

Click calculate to compute subnet information.

View Results

See network range, broadcast, usable hosts, and more.