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Net Subnet Calculator

Free tool — runs entirely in your browser.

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IPv4 CIDR Subnet Calculator

Subnet CIDR Calculator

Calculate network address, broadcast IP, mask, and usable host count instantly.

IP Address

CIDR Prefix (/24)

Subnet Breakdown

Network ID

192.168.1.0

Subnet Mask

255.255.255.0

Broadcast IP

192.168.1.255

Usable Hosts

254

Usable Host Range: 192.168.1.1 — 192.168.1.254

Wildcard Mask: 0.0.0.255

IP Binary: 11000000.10101000.00000001.00000001

Mask Binary: 11111111.11111111.11111111.00000000

Calculator Guide & Math

1What is an IPv4 Subnet CIDR Calculator?

The IPv4 Subnet Calculator calculates Network ID, Broadcast IP, Subnet Mask, Wildcard Mask, Usable Host Range, and total IP count from an IP address and CIDR prefix length (e.g. /24).

2Step-by-Step Usage Guide

You are configuring a local subnet (e.g. 192.168.1.1/24) and need to assign static IP addresses to network devices.

Enter target IPv4 address (e.g. 192.168.1.1) in the IP Address field
Select CIDR Prefix length (e.g. /24 for 255.255.255.0 subnet)
Inspect Network ID (192.168.1.0), Broadcast IP (192.168.1.255), and Usable Host Range (192.168.1.1 - 192.168.1.254)
Click "Copy Specs" to copy the subnet summary to clipboard for router configuration

Result Summary: Instant 254 usable host IP range with subnet mask and wildcard binary breakdown.

Frequently Asked Questions

CIDR (Classless Inter-Domain Routing) specifies subnet mask bits using slash notation (e.g. /24 = 255.255.255.0).