Lookproof

Turn a start and end IPv4 or IPv6 address into the smallest list of CIDR blocks that covers exactly that range (at most 62 for IPv4, 254 for IPv6). Offline. Use when an agent must write a range from a provider or registry as firewall, ACL or SPF entries. Input: ?start=192.0.2.10&end=192.0.2.20.

Open endpoint ↗

Price per call: $0.002
Chain: Base
Method: GET
Paid calls · 30 days: 1

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://api.lookproof.dev/v1/ip/range-to-cidr", { method: "GET" });
console.log(await res.json());

https://api.lookproof.dev/v1/ip/range-to-cidr