Ip Blacklist Checker MCP tool

Network tool

MCP findutils:ip_blacklist_checker

Return whether an IPv4 address is listed on 5 DNS blacklists (Barracuda, SpamCop, UCEPROTECT, JustSpam, PSBL), with listed, clean and failed counts. Lookups use Google DNS-over-HTTPS. A list that does not list its own test address 127.0.0.2 at the time of the check counts as failed, never as clean. Spamhaus is not checked: it refuses public DNS-over-HTTPS resolvers.

Needs an API key. Running a tool needs an API key. Keys are not for sale yet: ask for early access. About API keys

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Arguments

application/json

ip

string required

Public IPv4 address to check, e.g. "203.0.113.5". DNSBLs only support IPv4.

Example arguments

Verified

{
  "ip": "8.8.8.8"
}

claude mcp add findutils --transport http https://mcp.findutils.com/ --header "Authorization: Bearer YOUR_API_KEY"

{
  "mcpServers": {
    "findutils": {
      "url": "https://mcp.findutils.com/",
      "headers": {
        "Authorization": "Bearer YOUR_API_KEY"
      }
    }
  }
}

curl -X POST https://mcp.findutils.com/ \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "ip_blacklist_checker",
      "arguments": {
        "ip": "8.8.8.8"
      }
    }
  }'

Also a REST endpoint

The same tool answers plain HTTP at POST /api/tools/ip-blacklist-checker/execute.

REST reference

Rate limit: 120 a minute, per IP
Auth: API key
REST id: ip-blacklist-checker
MCP name: ip_blacklist_checker
Category: Network
Machine-readable: openapi.json · markdown.md

This tool fetches a fixed, hard-coded public upstream, never a private host. Results depend on that upstream.

Arguments

Example arguments

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