toolsko

Choose your language

ToolsKo is written in English. Prefer another language? Open a translated version of this public page.

Browser language suggestion: English. You can choose any language below.

Translation opens in a new tab using Google Translate. It receives this public page URL. Automatic translations may contain mistakes; use the original English page for tool inputs, downloads, and generated documents.

Your choice is remembered on this browser when storage is available. Use Language in the header to change it.

Subnet Calculator (CIDR / IPv4)

Network address, broadcast, mask, usable hosts and IP range from an address like 192.168.1.10/24.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: /24 means the first 24 bits are the network part: 256 addresses, 254 usable for devices.

How to use it (step by step)

  1. 1Fill in the boxes: “IP address / prefix (e.g. 192.168.1.10/24)”. Example numbers are already there so you can see how it works; replace them with yours.
  2. 2The result updates instantly as you type (on a phone it is below the boxes).
  3. 3The bold line is the main answer. Tap Copy next to any value to copy it.

Words to know

Masking
Hiding most of a number with dots or stars, like •••• 4242, so it cannot be misused.
Page range
A way to choose pages: 1-3 means pages 1 to 3; 5 means only page 5; 7- means page 7 to the end.
IP address
The address of a device on the internet, like a house number for your connection. Websites need it to send pages back to you.
IPv4 / IPv6
Two versions of IP addresses. IPv4 looks like 192.168.1.1 (running out); IPv6 is the newer, much longer kind like 2001:db8::1.
Subnet / CIDR
A way to split networks into blocks. 192.168.1.0/24 means 256 addresses from 192.168.1.0 to 192.168.1.255.

More in Network & Internet

IP Address Validator & Type CheckerCheck if IPs are valid and whether each is public, private, loopback, CGNAT or reserved.MAC Address FormatterReformat MAC addresses (colon, dash, dot, plain) and see if they are unicast/multicast or randomized.Random MAC Address GeneratorGenerate random, valid, locally administered MAC addresses for testing and virtual machines.Port Number Lookup (Common Ports)What runs on port 22, 443, 3389…? Search common TCP/UDP port numbers and services.User Agent ParserPaste a user agent string to see the browser, version, operating system, device and engine.Punycode Converter (IDN Domains)Convert international domain names like café.com to xn-- form and back.