DevUtility.site

CIDR Subnet & Usable IP Calculator

Network & HTTP • 100% Client-Side Processing

IPv4 CIDR range and subnet calculator. Enter CIDR notation like 192.168.0.0/24 or 10.0.0.0/16 to calculate netmask, network address, broadcast address, first and last usable host IPs, and total host capacity.

Privacy First: CIDR Subnet & Usable IP Calculator executes 100% locally in your web browser. No inputs or generated outputs leave your device.

Tool Chaining — Continue Workflow

Take your result from CIDR Subnet & Usable IP Calculator directly into companion utilities:

IPv4 Address Validator & Bitmask CalculatorIPv6 Address Validator

How to Use

  1. Enter CIDR notation (e.g. 10.0.0.0/24).
  2. Review Network Address, Broadcast Address, Netmask, First/Last Usable IP, and Total Hosts.

Key Features

  • •Prefixes from /0 to /32
  • •Netmask calculation (255.255.255.0)
  • •Usable host range calculation
  • •Bitwise accuracy

Technical Scope & Limitations

  • • IPv4 CIDR calculations only.