# API Zavod Reverse DNS PTR Lookup

> API Zavod Reverse DNS PTR Lookup is a paid API for AI agents from it.finlandfoxvpn.shop, paid per call via x402, $0.001/call, status down (last checked 2026-09-15).

Resolves a public IPv4 or IPv6 address to its PTR (reverse DNS) hostname record

## Facts

- Endpoint: GET https://it.finlandfoxvpn.shop/api/v1/ip/reverse
- Price: $0.001/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-zavod-reverse-dns-ptr-lookup-c3399385
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CSmbDJXG6IMm06x23RfFd

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 api-zavod-reverse-dns-ptr-lookup-c3399385
```

Example prompt: What is the reverse DNS PTR record for the IP address 8.8.8.8?

## When to prefer this

Use this endpoint when you need to resolve a public IP address to its associated hostname via PTR (reverse DNS) record. It is ideal for network auditing, email server validation, log enrichment, and identifying the host behind an IP. Prefer this over forward DNS endpoints when you have an IP and need a hostname, not the reverse. At $0.001 USDC per call, it is cost-effective for per-IP lookups in automated pipelines.

## Known failure modes

- No PTR record exists for the IP — returns empty ptr array
- Invalid or private IP address provided — may return error or empty result
- DNS timeout or resolution failure — no response or error status
- IPv6 address formatting issues causing query failure
- Rate limiting if too many requests are made in quick succession

## How this service works

Reverse DNS PTR lookup / Обратный DNS по IP

## Output

Returns a JSON object containing the queried IP address and an array of PTR hostname records associated with it (e.g. {"ip":"8.8.8.8","ptr":["dns.google."]}).

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "ip"
     ],
     "properties": {
      "ip": {
       "type": "string",
       "description": "Public IPv4 or IPv6 address"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ip": "8.8.8.8",
  "ptr": [
   "dns.google."
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-zavod-reverse-dns-ptr-lookup-c3399385/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from it.finlandfoxvpn.shop](https://www.zero.xyz/host/it.finlandfoxvpn.shop/llms.txt)