IP Blacklist Lookup

Overview

An IP blacklist check API for firewalls, fraud checks and signup screening. Send an IPv4 address and IP Blacklist Lookup checks it against an IP blacklist database of inbound threats (spam, scanning and brute-force sources) and outbound threats (command-and-control servers, malware and phishing hosts), refreshed four times a day. Every plan returns whether the IP is listed and whether it is a public address; paid plans add which list it is on, a threat level, Tor exit status, the ASN, the hosting provider, the IP's location, whether it is a VPN or datacenter address, live results from four public DNS blocklists (DroneBL, UCEPROTECT, 0spam and PSBL), and how many neighbouring addresses in the same /24 are listed.

Live Test IP Blacklist Lookup API →

Endpoint

One host, one path per API. The block below shows this call in four languages; every one of them is the same HTTP request. Making requests covers the timeouts, retries and parameter rules that apply to all of them. The SDKs wrap the same call in a typed client.

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curl "https://api.apiverve.com/v1/ipblacklistlookup?ip=185.220.101.1" \
  -H "x-api-key: your_api_key_here"

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const res = await fetch('https://api.apiverve.com/v1/ipblacklistlookup?ip=185.220.101.1', {
  headers: { 'x-api-key': 'your_api_key_here' },
});

if (!res.ok) throw new Error(`${res.status} ${await res.text()}`);

const { data } = await res.json();
console.log(data);

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import requests

res = requests.get(
    "https://api.apiverve.com/v1/ipblacklistlookup?ip=185.220.101.1",
    headers={"x-api-key": "your_api_key_here"},
    timeout=15,
)
res.raise_for_status()

print(res.json()["data"])

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package main

import (
	"fmt"
	"io"
	"net/http"
)

func main() {
	req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/ipblacklistlookup?ip=185.220.101.1", nil)
	req.Header.Set("x-api-key", "your_api_key_here")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()

	out, _ := io.ReadAll(res.Body)
	fmt.Println(string(out))
}

Replace your_api_key_here with the key from your dashboard. When the inputs arrive as a list rather than one at a time, batch requests run up to 200 of them through this same API in a single call.

Authentication

Send your key in the x-api-key header. That is the only auth step — there is no token exchange and no per-endpoint scope to configure. Authentication covers creating, rotating and revoking keys.

Parameters

Sent in the query string. Premium parameters are accepted on every plan but only take effect on plans that include them.

Response

Every API returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape. Response format covers the envelope, the other output formats and how premium fields are withheld.

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{
  "status": "ok",
  "error": null,
  "data": {
    "ipAddress": "185.220.101.1",
    "isIPBlacklisted": true,
    "isPublic": true,
    "inbound": {
      "found": true,
      "description": "IP is known for malicious inbound activity (spam, scanning, brute-force attacks)"
    },
    "outbound": {
      "found": true,
      "description": "IP is a known malicious destination (C2 server, malware host, phishing)"
    },
    "threatLevel": "critical",
    "isTor": true,
    "ipDetails": {
      "ip": "185.220.101.1",
      "country": "DE",
      "region": "BB",
      "timezone": "Europe/Berlin",
      "city": "Brandenburg an der Havel",
      "coordinates": [
        52.6171,
        13.1207
      ],
      "countryName": "Germany",
      "regionName": "Brandenburg",
      "postalCode": "14621",
      "continent": "EU",
      "continentName": "Europe",
      "accuracyRadius": 20,
      "isEU": true
    },
    "asn": "AS60729",
    "asnName": "TORSERVERS-NET",
    "hostingProvider": null,
    "listedInSubnet": 255,
    "isRiskySubnet": true,
    "isVpn": true,
    "isDatacenter": true,
    "isRelay": false,
    "blocklists": [
      {
        "name": "DroneBL",
        "zone": "dnsbl.dronebl.org",
        "listed": false
      },
      {
        "name": "UCEPROTECT Level 1",
        "zone": "dnsbl-1.uceprotect.net",
        "listed": false
      },
      {
        "name": "0spam",
        "zone": "bl.0spam.org",
        "listed": false
      },
      {
        "name": "PSBL",
        "zone": "psbl.surriel.com",
        "listed": false
      }
    ],
    "blocklistsListed": 0
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Errors

Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change. Error handling covers the full status list and which of them are worth retrying.

Use cases

Firewall Enhancement

Automatically block connections to/from known malicious IPs to strengthen your security posture

Threat Detection

Identify if incoming traffic originates from known malicious sources before processing requests

Outbound Security

Detect if your systems are attempting to connect to known command-and-control or malware servers

Security Auditing

Check historical connection logs against current threat intelligence to identify past compromises

Other ways to use IP Blacklist Lookup

Set up IP Blacklist Lookup on APIVerve, or reach the same source a different way. Your APIVerve account and credits work on all of them — one key, one balance.

Related

Pages that use this API:

• Block fake signupsGuides

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