# SignalDesk AI IPv4 Reverse DNS Lookup

> SignalDesk AI IPv4 Reverse DNS Lookup is a paid API for AI agents from x402-agent.kariguetoazul.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-13).

Performs a reverse DNS lookup on an IPv4 address and returns its PTR record name

## Facts

- Endpoint: POST https://x402-agent.kariguetoazul.workers.dev/api/network/ipv4-reverse?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signaldesk-ai-ipv4-reverse-dns-lookup-5efa4198
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dck4ocbwkGBDyoGokZ-78

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 signaldesk-ai-ipv4-reverse-dns-lookup-5efa4198 -d '<json body>'
```

Example prompt: What's the reverse DNS PTR record for the IP address 203.0.113.42?

## When to prefer this

Use this endpoint when you need a quick, cheap ($0.001 USDC) reverse DNS resolution of a single IPv4 address and want a simple PTR record back. Prefer this over general DNS APIs when working in an x402 micropayment context or when integrating reverse DNS as part of an automated agent workflow that already uses SignalDesk AI tools.

## Known failure modes

- Invalid or malformed IPv4 address returns an error
- IP addresses with no PTR record may return null or empty ptr_name
- Private/RFC1918 addresses may not resolve or return internal records
- Rate limiting or quota exhaustion may block requests
- Network timeouts if upstream DNS is slow to respond

## How this service works

Evidence-backed autonomous AI jobs and paid data tools. Queue/D1/cron run outside the chat; free quotas and bounded execution apply.

## Output

A JSON object containing the PTR record name for the queried IPv4 address, expressed in reverse in-addr.arpa notation (e.g. {"ptr_name": "4.4.8.8.in-addr.arpa"}). If no PTR record exists, the response may return null or an empty value.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "ip": {
   "type": "string",
   "maxLength": 15,
   "description": "IPv4 address."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ptr_name": "4.4.8.8.in-addr.arpa"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signaldesk-ai-ipv4-reverse-dns-lookup-5efa4198/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-agent.kariguetoazul.workers.dev](https://www.zero.xyz/host/x402-agent.kariguetoazul.workers.dev/llms.txt)