IPv4 CIDR calculator

IPv4 CIDR calculator in one GET: network, broadcast, netmask, wildcard, first/last usable host, total and usable counts, and the address-class and scope flags. curl: GET /cidr?cidr=192.168.1.10/24 (a bare address means /32). Response: {"ip":"192.168.1.10","prefix":24,"network":"192.168.1.0","broadcast":"192.168.1.255","netmask":"255.255.255.0","first_host":"192.168.1.1","last_host":"192.168.1.254"

Open endpoint ↗

Price per call: $0.001
Chain: Base
Method: GET
Paid calls · 30 days: 0

Call it from code

This API is run by its own provider and paid directly through x402. We list it so you can find it; we don't route or hold the payment.

import { x402Client, wrapFetchWithPayment } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";

const client = new x402Client();
registerExactEvmScheme(client, { signer: agentAccount });

const pay = wrapFetchWithPayment(fetch, client);
const res = await pay("https://x402-catalog-history.ai-business-surface.workers.dev/cidr", { method: "GET" });
console.log(await res.json());

https://x402-catalog-history.ai-business-surface.workers.dev/cidr