# DNS CNAME Lookup for vpn Subdomain

> DNS CNAME Lookup for vpn Subdomain 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 CNAME record of vpn.<domain> via Cloudflare DNS over HTTPS and reports its existence, records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/vpn/cname?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-cname-lookup-for-vpn-subdomain-39fd9b6d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_a42YxZCwHFkBAytKm1zv8

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-cname-lookup-for-vpn-subdomain-39fd9b6d
```

Example prompt: Can you check if vpn.example.com has a CNAME record? I want to know if it exists and what it points to.

## When to prefer this

Use this endpoint when you need a targeted, low-cost existence check for the vpn CNAME record on a specific domain without doing broad subdomain enumeration. Prefer this over generic DNS tools when you specifically want CNAME data for the vpn hostname resolved via Cloudflare's DoH for consistency and privacy. Best for security research, vendor assessments, or infrastructure audits.

## Known failure modes

- Domain does not have a vpn subdomain — returns no records with NXDOMAIN or NOERROR with empty answer
- Invalid or malformed domain name input — may return an error or empty response
- Cloudflare DoH resolver temporarily unavailable — network timeout or 5xx error
- Non-CNAME record type exists for vpn subdomain (e.g., A record only) — CNAME result will be empty
- Rate limiting or payment failure — 402 Payment Required if x402 payment not processed

## How this service works

CNAME record of vpn.<domain>: looks up the vpn host under the domain you give (CNAME 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 a CNAME record exists for the vpn subdomain of the given domain, the CNAME record value(s), the TTL in seconds, and the DNS response code, as answered by Cloudflare's DNS over HTTPS 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-cname-lookup-for-vpn-subdomain-39fd9b6d/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)