Read what the feeds say about a whole prefix

One prefix at a time, without looking every address up: for each signal group — datacenter, VPN, relay, Tor, anycast, RIR allocation, threat blocklist, crawler and corporate proxy — whether any installed feed overlaps it, how many feed records intersect it (a Tor group counts exits inside the prefix, a datacenter group the provider ranges that touch it) and which named providers do; whose network and country the first and last addresses resolve to and whether the two ends agree; and the registry facts of the first address. overlaps is tri-state exactly like the address flags, and record counts are capped at 10,000 per feed with truncated saying so, so a count is a floor for a very wide prefix.

The prefix travels as a query parameter, because a slash in a path segment has to be encoded and clients get that wrong: GET /api/v1/ip/range?prefix=203.0.113.0/24. A bare address is a /32 or /128, and the prefix comes back canonical (8.8.8.9/24 as 8.8.8.0/24). A prefix inside private or special-use space answers reason: "reserved_range" with every other field null, free.

curl https://spaw.co/api/v1/ip/range \
  -H "Authorization: Bearer sk_live_…"

const response = await fetch('https://spaw.co/api/v1/ip/range', {
  method: 'GET',
  headers: {
    'Authorization': 'Bearer sk_live_…',
  },
});
const result = await response.json();

import requests

response = requests.get(
    'https://spaw.co/api/v1/ip/range',
    headers={'Authorization': 'Bearer sk_live_…'},
)
result = response.json()

$ch = curl_init('https://spaw.co/api/v1/ip/range');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => ['Authorization: Bearer sk_live_…'],
]);
$result = json_decode(curl_exec($ch), true);

from spaw import Client

client = Client('sk_live_…')
result = client.lookup_ip_range('8.8.8.0/24')

import Spaw from 'spaw';

const spaw = new Spaw({ apiKey: 'sk_live_…' });
const result = await spaw.lookupIpRange('8.8.8.0/24');

use Spaw\Client;

$spaw = new Client('sk_live_…');
$result = $spaw->lookupIpRange('8.8.8.0/24');

{
    "success": true,
    "data": {
        "prefix": "8.8.8.0/24",
        "version": 4,
        "reason": null,
        "first": "8.8.8.0",
        "last": "8.8.8.255",
        "addresses": 256,
        "network": {
            "asn": 15169,
            "org": "Google LLC"
        },
        "network_agrees": true,
        "country": "US",
        "country_agrees": true,
        "registry": "arin",
        "registry_country": "US",
        "allocated_at": "2023-12-28",
        "signals": {
            "datacenter": {
                "overlaps": true,
                "ranges": 1,
                "providers": []
            },
            "vpn": {
                "overlaps": false,
                "ranges": 0,
                "providers": []
            },
            "relay": {
                "overlaps": false,
                "ranges": 0,
                "providers": []
            },
            "tor": {
                "overlaps": false,
                "ranges": 0,
                "providers": []
            },
            "anycast": {
                "overlaps": true,
                "ranges": 1,
                "providers": []
            },
            "allocated": {
                "overlaps": true,
                "ranges": 1,
                "providers": []
            },
            "blocklist": {
                "overlaps": false,
                "ranges": 0,
                "providers": []
            },
            "attack_source": {
                "overlaps": false,
                "ranges": 0,
                "providers": []
            },
            "crawler": {
                "overlaps": false,
                "ranges": 0,
                "providers": []
            },
            "corporate_proxy": {
                "overlaps": false,
                "ranges": 0,
                "providers": []
            }
        },
        "truncated": false,
        "sources": [
            {
                "dataset": "dbip-city-lite",
                "version": "2026-09"
            },
            {
                "dataset": "dbip-asn-lite",
                "version": "2026-09"
            },
            {
                "dataset": "datacenter-ranges",
                "version": "2026-09-12"
            },
            {
                "dataset": "vpn-ranges",
                "version": "2026-09-12"
            },
            {
                "dataset": "relay-ranges",
                "version": "2026-09-12"
            },
            {
                "dataset": "tor-exit-list",
                "version": "2026-09-12"
            },
            {
                "dataset": "anycast-ranges",
                "version": "2026-09-12"
            },
            {
                "dataset": "rir-allocations",
                "version": "2026-09-12"
            },
            {
                "dataset": "threat-blocklists",
                "version": "2026-09-12"
            },
            {
                "dataset": "crawler-ranges",
                "version": "2026-09-12"
            },
            {
                "dataset": "corporate-proxy-ranges",
                "version": "2026-09-12"
            }
        ]
    },
    "meta": {
        "credits_used": 1,
        "credits_remaining": 8,
        "cache_hit": false,
        "request_id": "req_01m1kgdm4xngzmbmff68g94w0c"
    }
}

{
    "success": false,
    "error": {
        "code": "UNAUTHENTICATED",
        "message": "Provide a valid API key as a bearer token.",
        "request_id": "req_01m1kgdm4xngzmbmff68g94w0c"
    }
}

{
    "success": false,
    "error": {
        "code": "INSUFFICIENT_CREDITS",
        "message": "Your credit balance is empty.",
        "request_id": "req_01m1kgdm4xngzmbmff68g94w0c"
    }
}

{
    "success": false,
    "error": {
        "code": "VALIDATION_FAILED",
        "message": "The email field is required.",
        "errors": {
            "email": [
                "The email field is required."
            ]
        },
        "request_id": "req_01m1kgdm4xngzmbmff68g94w0c"
    }
}

{
    "success": false,
    "error": {
        "code": "RATE_LIMITED",
        "message": "Too many requests. Retry after the limit resets.",
        "request_id": "req_01m1kgdm4xngzmbmff68g94w0c"
    }
}