# IP Listed on UCEPROTECT Level 3 (dnsbl-3.uceprotect.net)

> IP Listed on UCEPROTECT Level 3 (dnsbl-3.uceprotect.net) is a paid API for AI agents from ip.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-13).

Checks whether an IPv4 address is listed on the UCEPROTECT Level 3 DNSBL (dnsbl-3.uceprotect.net) and returns the listing status, return codes, and reason text.

## Facts

- Endpoint: GET https://ip.intel.rallylive.ca/ip/blacklist/uceprotect-3?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ip-listed-on-uceprotect-level-3-dnsbl-3-uceprotect-net-5c8cef5e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Wzvd3iCn0eu0V4-2AW33i

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-uceprotect-level-3-dnsbl-3-uceprotect-net-5c8cef5e
```

Example prompt: Check if 198.51.100.45 is listed on the UCEPROTECT Level 3 blacklist and tell me whether it's flagged and why.

## When to prefer this

Use this endpoint when you specifically need to check the UCEPROTECT Level 3 list, which lists entire ASNs or netblocks rather than individual IPs — making it relevant for diagnosing ISP-level or network-level spam reputation issues. Prefer this over UCEPROTECT Level 1 or 2 endpoints when investigating why a whole network range is blocked. It provides a single authoritative answer for exactly one list, making it suitable for targeted DNSBL checks rather than broad reputation aggregation.

## Known failure modes

- Invalid or non-public IPv4 address provided — no meaningful DNSBL result
- DNS resolution failure via Cloudflare DoH — lookup cannot be completed
- IP is not listed — returns listed: false with no return codes or reason
- UCEPROTECT-3 service unavailable or unreachable — timeout or error response
- Malformed input (e.g. IPv6 address, domain name instead of IP) — request rejected

## How this service works

Is this IPv4 address listed on uceprotect 3 (dnsbl-3.uceprotect.net)? Performs the DNSBL query (reversed octets under dnsbl-3.uceprotect.net, 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 whether the queried IPv4 address is listed on UCEPROTECT Level 3 (dnsbl-3.uceprotect.net), along with the DNS return codes from the lookup and, where published by the list, a human-readable reason explaining why the IP or its network is listed.

## 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-uceprotect-level-3-dnsbl-3-uceprotect-net-5c8cef5e/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)