# IP Listed on s5h DNSBL Check

> IP Listed on s5h DNSBL Check 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 s5h blocklist (all.s5h.net) via a DNSBL query using Cloudflare DoH, returning listed status, return codes, and reason text.

## Facts

- Endpoint: GET https://ip.intel.rallylive.ca/ip/blacklist/s5h?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-s5h-dnsbl-check-5bdee06b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_35xai_Bf7Gez-umXeMxHL

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-s5h-dnsbl-check-5bdee06b
```

Example prompt: Can you check if the IP address 192.168.1.1 is listed on the s5h blocklist and tell me the return code and reason if it is?

## When to prefer this

Use this endpoint when you need a precise, single-list check against s5h specifically — ideal when you already know s5h is the relevant blocklist for your use case (e.g. email deliverability pipelines that track s5h listings), or when you want authoritative s5h status with reason codes rather than a broad multi-list reputation score.

## Known failure modes

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

## How this service works

Is this IPv4 address listed on s5h (all.s5h.net)? Performs the DNSBL query (reversed octets under all.s5h.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 a yes/no listed status for the queried IPv4 address on the s5h blocklist, along with the DNS return codes from the DNSBL query 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-s5h-dnsbl-check-5bdee06b/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)