# DNS A Record Lookup for VPN Subdomain via Cloudflare DoH

> DNS A Record Lookup for VPN Subdomain via Cloudflare DoH is a paid API for AI agents from dns.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-21).

Looks up the A record of vpn.<domain> using Cloudflare DNS over HTTPS and reports whether the host exists, its IP records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/vpn/a?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dns-a-record-lookup-for-vpn-subdomain-via-cloudflare-doh-97a0bd14
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_50jyTkGcRz_QMX55txb6D

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 dns-a-record-lookup-for-vpn-subdomain-via-cloudflare-doh-97a0bd14
```

Example prompt: Can you check if vpn.example.com exists in DNS — specifically the A record — and tell me what IP it resolves to and the TTL?

## When to prefer this

Use this endpoint when you need a quick, targeted existence check for the vpn subdomain of a specific domain without enumerating all subdomains. Prefer this over general DNS lookup tools when you specifically want the A record for the vpn host resolved via Cloudflare DoH, and when a cheap per-call cost model ($0.01) is acceptable.

## Known failure modes

- Domain does not have a vpn subdomain (NXDOMAIN response returned)
- Invalid or malformed domain name input causes query failure
- Cloudflare DoH service temporarily unavailable
- Domain exists but has no A record (e.g. only CNAME or AAAA records)
- Rate limiting or payment failure for the $0.01 per-call fee

## How this service works

A record of vpn.<domain>: looks up the vpn host under the domain you give (A via Cloudflare DoH) and reports whether it exists, its records and TTL. Quick existence check for common hosts like vpn without enumerating subdomains. $0.01 per lookup.

## Output

Returns whether the vpn.<domain> A record exists, the resolved IP address(es), the TTL value, and the DNS response code (e.g. NOERROR or NXDOMAIN) as answered by Cloudflare DNS over HTTPS.

## 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/dns-a-record-lookup-for-vpn-subdomain-via-cloudflare-doh-97a0bd14/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from dns.intel.rallylive.ca](https://www.zero.xyz/host/dns.intel.rallylive.ca/llms.txt)