How do I use the IP Subnet Calculator?

Enter an IPv4 address (e.g., 192.168.1.100). Select the CIDR prefix length (subnet mask) from the dropdown. Click Calculate to see network, broadcast, host range, and other details. Review the binary breakdown for a visual representation.

Is the IP Subnet Calculator free?

Yes, the IP Subnet Calculator is completely free. It runs entirely in your browser with no signup, no download, and no data sent to any server.

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IP Subnet Calculator

Calculate IPv4 subnet details including network, broadcast, host range, and binary breakdown.

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IP subnet calculator

IPv4 Subnet Calculator

Enter an IP address and subnet mask (CIDR) to calculate network details.

IP address CIDR / Prefix

How to use

How to Use the IP Subnet Calculator

1 Enter an IPv4 address (e.g., 192.168.1.100).
2 Select the CIDR prefix length (subnet mask) from the dropdown.
3 Click Calculate to see network, broadcast, host range, and other details.
4 Review the binary breakdown for a visual representation.

The IP Subnet Calculator computes all subnet properties from an IP address and CIDR prefix. The network address is the first address in the subnet (all host bits set to 0). The broadcast address is the last address (all host bits set to 1). Usable host addresses are everything between these two. A /24 subnet has 254 usable hosts, while a /16 has 65,534.

CIDR (Classless Inter-Domain Routing) notation replaces the older classful addressing system. A /24 is equivalent to a 255.255.255.0 subnet mask. The binary breakdown shows exactly which bits belong to the network portion (masked) and which belong to the host portion. This tool is essential for network administrators, DevOps engineers, and anyone configuring network infrastructure.

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