# IP Listed on InterServer DNSBL

> IP Listed on InterServer 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 2026-10-13).

Checks whether a given IPv4 address is listed on the InterServer DNS blacklist (rbl.interserver.net) and returns the listing status, return codes, and reason text.

## Facts

- Endpoint: GET https://ip.intel.rallylive.ca/ip/blacklist/interserver?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-interserver-dnsbl-8cd72e7d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uT0YjUf1yI3FASUXK6-px

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-interserver-dnsbl-8cd72e7d
```

Example prompt: Can you check if 198.51.100.42 is listed on the InterServer blacklist (rbl.interserver.net) and tell me the return code and any reason given?

## When to prefer this

Choose this endpoint when you need a precise, single-list lookup specifically against the InterServer DNSBL (rbl.interserver.net), rather than a multi-list aggregation. Ideal for targeted spam filtering decisions, email deliverability diagnostics, or automated reputation screening pipelines where you want the exact InterServer listing status with return codes and reason text at low per-query cost.

## Known failure modes

- Invalid or non-public IPv4 address provided — query may fail or return no result
- DNS resolution failure via Cloudflare DoH — transient network error
- IP not found in the DNSBL — returns listed: false with no reason text
- Malformed input (e.g. IPv6 address or hostname instead of IPv4) — may return an error or unexpected result

## How this service works

Is this IPv4 address listed on interserver (rbl.interserver.net)? Performs the DNSBL query (reversed octets under rbl.interserver.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 rbl.interserver.net (yes/no), the DNSBL return code(s), and, where published by the list, a human-readable reason string explaining why the IP was 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-interserver-dnsbl-8cd72e7d/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)