IP Subnet Calculator

Calculate IP subnet details, network ranges, and CIDR notation

IP Address

Prefix Length

Network Address

192.168.1.0

Broadcast Address

192.168.1.255

Subnet Mask

255.255.255.0

Wildcard Mask

0.0.0.255

CIDR Notation

192.168.1.0/24

First Usable Host

192.168.1.1

Last Usable Host

192.168.1.254

Total Addresses

256

Usable Hosts

254

IP Class

C

IP (Binary)

11000000.10101000.00000001.01100100

Common Subnet Masks

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What is IP Subnet Calculator?

Free online IP subnet calculator to calculate IP subnet information from any IP address and subnet mask or CIDR notation.

Get detailed results including network address, broadcast address, first and last usable host, total number of hosts, wildcard mask, and binary representations. Supports both IPv4 and CIDR notation input. Essential for network engineers, system administrators, and anyone planning IP address allocation. All calculations run in your browser - fast, private, and free. No signup required.

How to Use IP Subnet Calculator

1Enter an IP address and subnet mask, or use CIDR notation (e.g., 192.168.1.0/24)
2View the calculated network address, broadcast address, and usable host range
3Check the total number of hosts, wildcard mask, and binary representations
4Adjust the subnet mask or CIDR prefix to plan your network address allocation

Frequently Asked Questions

A subnet (subnetwork) is a logical subdivision of an IP network. Subnetting divides a larger network into smaller, more manageable segments. Each subnet has its own range of IP addresses, a network address, and a broadcast address. Subnetting improves network performance, security, and address management.

CIDR (Classless Inter-Domain Routing) notation combines an IP address with a prefix length separated by a slash. For example, 192.168.1.0/24 means the first 24 bits are the network portion, leaving 8 bits for host addresses (254 usable hosts). CIDR replaced the older classful addressing system.

Choose a subnet mask based on how many hosts you need. A /24 gives 254 hosts, /25 gives 126, /26 gives 62, and so on. Enter different CIDR values in the calculator to see the number of available hosts and find the best fit for your network requirements.

The network address is the first address in a subnet (all host bits set to 0) and identifies the subnet itself. The broadcast address is the last address (all host bits set to 1) and is used to send data to all hosts on the subnet. Neither can be assigned to individual hosts.

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What is IP Subnet Calculator?

Free online IP subnet calculator to calculate IP subnet information from any IP address and subnet mask or CIDR notation.

How to Use IP Subnet Calculator

1Enter an IP address and subnet mask, or use CIDR notation (e.g., 192.168.1.0/24)

2View the calculated network address, broadcast address, and usable host range

3Check the total number of hosts, wildcard mask, and binary representations

4Adjust the subnet mask or CIDR prefix to plan your network address allocation

Frequently Asked Questions