# Reverse DNS PTR Lookup via DNSPod

> Reverse DNS PTR Lookup via DNSPod 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).

Performs a reverse DNS (PTR) lookup for an IPv4 address using DNSPod (doh.pub) and returns hostname(s), TTL, response code, and forward-confirmed reverse DNS (FCrDNS) status.

## Facts

- Endpoint: GET https://ip.intel.rallylive.ca/ip/ptr/via/dnspod?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/reverse-dns-ptr-lookup-via-dnspod-82924040
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fq8zau8JYQv-PhiXd5hsg

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 reverse-dns-ptr-lookup-via-dnspod-82924040
```

Example prompt: What is the reverse DNS hostname for the IP address 8.8.8.8 according to DNSPod — and does its PTR record forward-confirm back to the same IP?

## When to prefer this

Choose this endpoint when you specifically need the PTR record as seen by DNSPod (doh.pub), for example to compare resolver behavior, detect filtered or stale PTR records, or validate email server rDNS from a Chinese-network perspective. If you need FCrDNS validation via a specific resolver rather than a generic rDNS lookup, this endpoint provides that explicitly.

## Known failure modes

- No PTR record exists for the IP — NXDOMAIN or NOERROR with empty answer returned
- DNSPod resolver is unreachable or times out — upstream DNS error
- Invalid IPv4 address format supplied — request validation error
- FCrDNS check fails if the forward A record doesn't exist or doesn't match the original IP
- DNSPod may return filtered or stale records differing from authoritative answers

## How this service works

Reverse DNS (PTR) of an IPv4 address as answered by DNSPod (doh.pub): the hostname(s), TTL and response code, plus whether the PTR's forward A record points back (forward-confirmed reverse DNS). Compare resolvers for stale or filtered answers. $0.01 per lookup.

## Output

Returns the PTR hostname(s) associated with the queried IPv4 address as resolved by DNSPod (doh.pub), along with the TTL, DNS response code, and a forward-confirmed reverse DNS (FCrDNS) flag indicating whether the PTR hostname's A record resolves back to the original IP.

## 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/reverse-dns-ptr-lookup-via-dnspod-82924040/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)