Cidr Compare

{
  "a": "10.0.0.0/16",
  "addressesInA": "65536",
  "addressesInB": "256",
  "asOf": "2026-10-11T14:45:30.515Z",
  "b": "10.0.5.0/24",
  "commonSupernet": "10.0.0.0/16",
  "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.",
  "ipInA": true,
  "ipInB": true,
  "ipTested": "10.0.5.77",
  "mergedParent": null,
  "notChecked": [
    "whether either block is allocated or routed",
    "the host bits of inputs, which are cleared to the network address"
  ],
  "overlapAddresses": "256",
  "overlaps": true,
  "reasons": [
    "CIDR blocks are either nested or disjoint: they never partially overlap.",
    "10.0.5.77 is inside 10.0.0.0/16 and inside 10.0.5.0/24."
  ],
  "relationship": "A_CONTAINS_B",
  "siblings": false,
  "source": "CIDR containment arithmetic (RFC 4632), computed locally",
  "summary": "10.0.0.0/16 contains 10.0.5.0/24.",
  "verdict": "A_CONTAINS_B",
  "version": 4
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://network-calc.x402tookit.com/cidr-compare?a=10.0.0.0%2F16&b=10.0.5.0%2F24&ip=10.0.5.77'

# 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/cidr-compare?a=10.0.0.0%2F16&b=10.0.5.0%2F24&ip=10.0.5.77' \
  | 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%2Fcidr-compare
const res = await pay("https://network-calc.x402tookit.com/cidr-compare?a=10.0.0.0%2F16&b=10.0.5.0%2F24&ip=10.0.5.77");
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/cidr-compare?a=10.0.0.0%2F16&b=10.0.5.0%2F24&ip=10.0.5.77")
    print(res.status_code, res.text)