IP Blacklist Check API — DNSBL Reputation Lookup

Description

Query an IP address or domain against 30+ DNS-based blacklists (DNSBLs) simultaneously. Detect if an IP is listed for spam, malware, or other abuse. Essential for monitoring email deliverability and server reputation.

Use Cases

Check email server IP reputation before sending campaigns
Monitor server IPs for blacklist listings
Investigate spam or abuse reports
Due diligence for IP address purchases

Parameters

Name	Type	Required	Description
`ip`	string	Yes	IP address to check
`format`	string	No	Response format: json or markdown

Example Request

bash

curl -H 'X-API-Key: YOUR_KEY' \
  'https://api.example.com/dns/blacklist?ip=1.2.3.4'

python

import httpx

resp = httpx.get(
    "https://api.example.com/dns/blacklist?ip=1.2.3.4",
    headers={"X-API-Key": "YOUR_KEY"},
)
print(resp.json())

javascript

const resp = await fetch("https://api.example.com/dns/blacklist?ip=1.2.3.4", {
  headers: { "X-API-Key": "YOUR_KEY" },
});
const data = await resp.json();
console.log(data);

Example Response

json

{
  "ip": "1.2.3.4",
  "listed_count": 2,
  "total_checked": 32,
  "listings": [
    {"blacklist": "zen.spamhaus.org", "listed": true},
    {"blacklist": "bl.spamcop.net", "listed": true}
  ]
}

IP Blacklist Check

Description

Use Cases

Parameters

Related Tools in IP

Reverse DNS Lookup

ASN Lookup