Network & DNS100% In-BrowserCIDR Calculator
IP Address & Subnet Validator
Validate IPv4 / IPv6 addresses, calculate CIDR subnet ranges, broadcast addresses, and usable host counts.
Real-time processing·No server uploads·Zero telemetry
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How to Use IP Address & Subnet Validator
01
Enter an IP or CIDR block (e.g. 192.168.1.0/24 or 10.0.0.1).
02
View IP version, format validity, netmask, wildcard mask, and host capacity.
03
Inspect first and last usable host IPs.
Privacy Guarantee
IP Address & Subnet Validator runs 100% client-side in your web browser. Your data, passwords, keys, and files are processed using the Web Crypto API and never transmitted to any server. Zero telemetry, zero storage, zero cloud processing.
Frequently Asked Questions
How many usable hosts are in a /24 subnet?
A /24 subnet has 256 total IP addresses and 254 usable hosts (excluding network and broadcast addresses).
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