# DNS AAAA Record Lookup for vpn.<domain> via Cloudflare DoH

> DNS AAAA Record Lookup for vpn.<domain> 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 IPv6 (AAAA) DNS record for the vpn subdomain of a given domain using Cloudflare DNS over HTTPS, returning existence status, records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/vpn/aaaa?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-aaaa-record-lookup-for-vpn-domain-via-cloudflare-doh-42f7ccab
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_I-xcaPrkuLlsqDskS3_LT

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-aaaa-record-lookup-for-vpn-domain-via-cloudflare-doh-42f7ccab
```

Example prompt: Check whether vpn.example.com has an IPv6 (AAAA) DNS record — I want to know if the VPN subdomain exists and what its address and TTL are.

## When to prefer this

Use this endpoint when you need a fast, targeted IPv6 DNS existence check specifically for the vpn subdomain of a domain, without performing broad subdomain enumeration. Prefer it over general DNS lookup tools when you only care about VPN host IPv6 reachability and want a low-cost ($0.01) single-purpose check via Cloudflare's reliable DoH infrastructure.

## Known failure modes

- Domain does not exist — returns NXDOMAIN or equivalent non-existence response
- vpn subdomain has no AAAA record — returns empty records but no error
- Invalid domain format provided — may return error or empty result
- Cloudflare DoH service unavailable — upstream resolver failure
- Network timeout reaching the DoH endpoint

## How this service works

AAAA record of vpn.<domain>: looks up the vpn host under the domain you give (AAAA 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> AAAA record exists, the IPv6 address records if present, the TTL value, and the DNS response code from Cloudflare's DoH resolver.

## 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-aaaa-record-lookup-for-vpn-domain-via-cloudflare-doh-42f7ccab/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)