Subnet Calculator

About Subnet Calculator

Subnet Calculator takes CIDR notation (e.g. 192.168.1.0/24) and calculates the network address, broadcast address, subnet mask in decimal form, wildcard mask, usable host address range, and total number of hosts. It is an essential tool when designing an IP addressing scheme for an office network, splitting an IP block into several subnets, or filling in firewall and routing configuration without miscalculating address boundaries.

How to use

1. 1 Paste or type the data you want to process into the input field.
2. 2 Adjust the available options (format, length, algorithm, etc.) to suit your needs.
3. 3 Results appear instantly in your browser - everything runs locally and no data is sent to a server.

Free tools from Computing ID

Subnet Calculator is one of dozens of network, security, and developer utilities provided free of charge by Computing ID (PT Intprism Computing Technology). Every tool can be used without creating an account or logging in. For tools that run entirely in the browser, your data is never sent to our servers; for tools that need to call a server (such as a DNS lookup or SSL check), only the target you enter is processed, and it is not stored. If you need infrastructure to run your own services, Computing ID also offers Linux and Windows VPS, cPanel hosting, email hosting, S3 Object Storage, WireGuard VPN, and domain registration, with data centers in Indonesia and Singapore and 24/7 technical support.