# IP Listed on Barracuda DNSBL

> IP Listed on Barracuda DNSBL is a paid API for AI agents from ip.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-11).

Checks whether a given IPv4 address is listed on the Barracuda reputation blocklist (b.barracudacentral.org) via a DNS-based lookup and returns listed/not-listed with return codes and reason text.

## Facts

- Endpoint: GET https://ip.intel.rallylive.ca/ip/blacklist/barracuda?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ip-listed-on-barracuda-dnsbl-76b39651
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fNgwH3SNuAMd2IBc9vOk6

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability ip-listed-on-barracuda-dnsbl-76b39651
```

Example prompt: Can you check if the IP address 198.51.100.45 is listed on the Barracuda blocklist and tell me the result along with any reason codes returned?

## When to prefer this

Choose this endpoint when you need a precise, single-list answer specifically from Barracuda Central (b.barracudacentral.org), which is widely used in email security and spam filtering decisions. It is ideal for checking mail server IPs before campaigns, triaging suspicious senders, or enriching security alerts with Barracuda reputation data. Prefer it over generic multi-list DNSBL tools when you specifically need Barracuda's verdict, and over bulk endpoints when you need a single authoritative lookup with reason codes.

## Known failure modes

- Invalid or malformed IPv4 address — the query will fail or return an error
- IPv6 addresses are not supported; only IPv4 lookups are valid
- DNS resolution failure via Cloudflare DoH may cause a timeout or error response
- Private/reserved IP ranges may return unexpected or no results from the DNSBL
- Network connectivity issues between the service and Cloudflare DoH could cause intermittent failures

## How this service works

Is this IPv4 address listed on barracuda (b.barracudacentral.org)? Performs the DNSBL query (reversed octets under b.barracudacentral.org, via Cloudflare DoH) and returns listed yes/no with the return codes and, where the list publishes one, the reason text. One list, one precise answer. $0.01 per lookup.

## Output

Returns a yes/no answer on whether the IPv4 address is listed in the Barracuda Central DNSBL (b.barracudacentral.org), along with the DNS return codes and, where available, the reason text published by the list (e.g. 'spam source').

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ip-listed-on-barracuda-dnsbl-76b39651/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ip.intel.rallylive.ca](https://www.zero.xyz/host/ip.intel.rallylive.ca/llms.txt)