IPv4 subnet calculator.

Our free IPv4 subnet calculator shows the network address, usable host range, broadcast address, CIDR notation and wildcard mask of any IPv4 block - and splits it into smaller subnets.

Subnet calculator.

IPv4 IPv6

IP Address

Subnet

N. of Subnets

N. of IPs per Subnet

All 1 possible /24 networks with 256 IPs each for 192.168.1.*/24.

CIDR Notation192.168.1.0/24

Wildcard Mask0.0.0.255

Subnet Address	Host Address Range	Broadcast Address	Usable IPs
192.168.1.0	192.168.1.1 - 192.168.1.254	192.168.1.255	254

How to use the IPv4 subnet calculator?

Enter an IPv4 address and pick a subnet mask from /8 to /32. To divide the block, choose the number of subnets or the number of IPs per subnet - the two always match. The calculator shows the CIDR notation and wildcard mask, and a table with the subnet address, host address range, broadcast address and usable IPs of each subnet. You can export the table as a CSV file. New to subnetting? Read what a subnet mask is.

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Frequently asked questions.

A subnet calculator works out the network address, broadcast address, usable host range and mask for an IP block, and can split a block into equal subnets. Network and DevOps teams use it to plan address ranges, write firewall rules and configure cloud networks without arithmetic mistakes.

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