IP Subnet Calculator

Calculate network address, broadcast, host range, and CIDR/mask conversions. Free IPv4 subnet calculator.

About this IP Subnet Calculator tool

Enter any IP/CIDR or IP/mask and CheckHub computes network address, broadcast, first/last usable host, total hosts, and wildcard mask.

How to use the IP Subnet Calculator

Step 1. Enter an IP and prefix (e.g. 192.168.1.0/24).
Step 2. Read network, broadcast, and host range.

Frequently asked questions

How do I convert mask to CIDR?: Count the contiguous 1 bits in the mask. 255.255.255.0 = /24, 255.255.0.0 = /16.

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