ToolVet
80trust / 100

Subnet Calc

by NetIntel in Developer tools

x402 APIPassing, checked 30 min ago

Calculates IPv4/IPv6 subnet details from CIDR notation — network/broadcast, netmask, wildcard (Cisco ACL) mask, binary/hex masks, usable host range, RFC classification (private/loopback/multicast), supernet, and subnet-split counts. Pass comma-separated CIDRs to detect overlaps and classify each pair (subnet/supernet/partial overlap/disjoint); multi-CIDR responses return {subnets, overlaps}.

GET
https://netintel.dev/subnet/calc
Price
$0.005
per call in USDC
Uptime
100%
last 30 days
Response time
248 ms
430 ms slowest 5%
Last check
Passed
30 min ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed · Watch with other listings

How to call it

GET https://netintel.dev/subnet/calc

Each call costs $0.005 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

GET https://netintel.dev/subnet/calc?cidr=10.0.1.0%2F24

Parameters

ParameterTypeRequiredDescription
cidrstringYesCIDR block, e.g. 10.0.1.0/24 or 2001:db8::/48 (IPv6). Comma-separate multiple CIDRs for overlap/containment analysis, e.g. 10.0.0.0/16,10.0.1.0/24

Example response

The provider's example. We can't check it without paying.

Example response, 36 lines
{
  "binary_mask": "11111111111111111111111100000000",
  "broadcast": "10.0.1.255",
  "cidr": "10.0.1.0/24",
  "first_usable": "10.0.1.1",
  "hex_mask": "ffffff00",
  "ip_version": 4,
  "is_private": true,
  "last_usable": "10.0.1.254",
  "netmask": "255.255.255.0",
  "network": "10.0.1.0",
  "prefix_length": 24,
  "rfc_classification": "Private (RFC 1918)",
  "subnets": [
    {
      "count": 2,
      "prefix": "/25"
    },
    {
      "count": 4,
      "prefix": "/26"
    },
    {
      "count": 8,
      "prefix": "/27"
    },
    {
      "count": 16,
      "prefix": "/28"
    }
  ],
  "supernet": "10.0.0.0/23",
  "total_hosts": 256,
  "usable_hosts": 254,
  "wildcard": "0.0.0.255"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.005.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://netintel.dev/subnet/calc?cidr=10.0.1.0%2F24'

# 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://netintel.dev/subnet/calc?cidr=10.0.1.0%2F24' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// 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 $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
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 $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fnetintel.dev%2Fsubnet%2Fcalc
const res = await pay("https://netintel.dev/subnet/calc?cidr=10.0.1.0%2F24");
console.log(res.status, await res.text());
Python: pay and call
# 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 $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://netintel.dev/subnet/calc?cidr=10.0.1.0%2F24")
    print(res.status_code, res.text)

Security scan

No findings

We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
30 min agoPassed402329 ms$0.005
5 h agoPassed402192 ms$0.005
10 h agoPassed402294 ms$0.005
14 h agoPassed402188 ms$0.005
18 h agoPassed402430 ms$0.005
Show 10 older checks
23 h agoPassed402330 ms$0.005
27 h agoPassed402287 ms$0.005
31 h agoPassed402408 ms$0.005
35 h agoPassed402178 ms$0.005
40 h agoPassed402283 ms$0.005
44 h agoPassed402185 ms$0.005
2 days agoPassed402262 ms$0.005
2 days agoPassed402303 ms$0.005
2 days agoPassed402443 ms$0.005
3 days agoPassed402192 ms$0.005