Netmask Convert

{
  "asOf": "2026-10-11T14:45:31.831Z",
  "binary": "11111111.11111111.11111100.00000000",
  "blockSizeLastOctet": null,
  "cidrSuffix": "/22",
  "classfulDefault": null,
  "degraded": false,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "hex": "0xfffffc00",
  "hostBits": 10,
  "inputKind": "dotted",
  "netmask": "255.255.252.0",
  "networkBits": 22,
  "notChecked": [
    "IPv6 (prefix length only; use /cidr-ipv6)",
    "0.0.0.0 and 255.255.255.255 are read as masks /0 and /32 (they are also the all-hosts and exact-match wildcards)",
    "…1 more"
  ],
  "percentOfIpv4Space": 0.00002384,
  "prefixLength": 22,
  "reasons": [
    "Input read as a dotted.",
    "Usable hosts exclude the network and broadcast addresses."
  ],
  "source": "CIDR/netmask arithmetic (RFC 4632) and RFC 3021 for /31, computed locally",
  "subnetsOfPrefix24": 4,
  "summary": "/22 = 255.255.252.0 (wildcard 0.0.3.255), 1024 addresses, 1022 usable hosts.",
  "totalAddresses": 1024,
  "usableHosts": 1022,
  "valid": true,
  "verdict": "CONVERTED",
  "wildcard": "0.0.3.255"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://network-calc.x402tookit.com/netmask-convert?value=255.255.252.0'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://network-calc.x402tookit.com/netmask-convert?value=255.255.252.0' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fnetwork-calc.x402tookit.com%2Fnetmask-convert
const res = await pay("https://network-calc.x402tookit.com/netmask-convert?value=255.255.252.0");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://network-calc.x402tookit.com/netmask-convert?value=255.255.252.0")
    print(res.status_code, res.text)