ForHosting KIT · Developer Utilities

Subnet prefix cheatsheet

IPv4 subnetting still starts from a prefix length: a slash-24 is not a guess, it is the mask 255.255.255.0, an eight-bit host field, two hundred fifty-six addresses, and two hundred fifty-four usable hosts once the network and broadcast addresses are reserved.

● BetaFree · in your browser

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

Students, CCNA candidates, firewall operators, and ACL authors look up that mapping dozens of times a day and should not recompute powers of two on a whiteboard. This subnet prefix cheatsheet calculator builds a reference table for every requested IPv4 prefix length from prefix_from through prefix_to inclusive. Each row lists the dotted subnet mask, the inverted wildcard mask used by Cisco-style access lists, the total address count two to the power of host bits, and the usable host count with the modern slash-31 point-to-point and slash-32 host-route conventions. The same deterministic module powers the free browser widget and the API, so study notes, runbooks, and CI fixtures never disagree on whether a slash-31 has two usable addresses.

How to use it

Enter your values in the form above. The tool checks them before calculating and shows the result on the same page.

Check your inputs

Use the labels and units shown next to each field. If something is missing or outside the allowed range, the page points to the field to fix.

Use it again or automate it

Use the browser tool for individual checks and the API when you need the same capability in an automated workflow.

What you can do with it

Get an answer now

Enter one set of values and see the result without building a spreadsheet or script.

Compare scenarios

Change one value at a time and rerun the calculation to understand what affects the result.

Automate repeated work

Use the API when the same calculation needs to run inside your product or workflow.

FAQ

How do I use this capability?

Complete the fields above and run it on this page. The form highlights anything that needs attention.

For developers — API access

Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.

API endpoint

POSThttps://api.kit.forhosting.com/dev/subnet-hosts-table

Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.

Call it from your stack

curl -X POST https://api.kit.forhosting.com/dev/subnet-hosts-table \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"prefix_from":24,"prefix_to":30}'

const res = await fetch("https://api.kit.forhosting.com/dev/subnet-hosts-table", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "prefix_from": 24,
    "prefix_to": 30
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/dev/subnet-hosts-table",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "prefix_from": 24,
    "prefix_to": 30
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/dev/subnet-hosts-table", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"prefix_from":24,"prefix_to":30}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"prefix_from":24,"prefix_to":30}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/dev/subnet-hosts-table", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "prefix_from": 24,
  "prefix_to": 30
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "dev.subnet_hosts_table",
  "status": "queued",
  "_links": {
    "result": "/tasks/tsk_…/result"
  }
}

The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.

Pricing

Per request$0.002

Published price — no tokens, no invented credits. A failed task is never charged.

Errors

HTTP	Code	Meaning
`401`	`unauthorized`	Missing or invalid API key.
`402`	`insufficient_balance`	Your balance doesn't cover the task price.
`404`	`unknown_type`	That task type doesn't exist.
`429`	`rate_limited`	Too many requests. Use the webhook instead of polling.

Read the full KIT documentation →