# dns-cname-old-subdomain

> dns-cname-old-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 2026-10-20).

Looks up the CNAME DNS record for the 'old' subdomain of a given domain via Cloudflare DoH and reports whether it exists, its records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/old/cname?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dns-cname-old-subdomain-6cf29a78
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bqtE3g7c3pCK2DgNDdtdn

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-old-subdomain-6cf29a78
```

Example prompt: Can you check if the 'old' subdomain of rallylive.ca has a CNAME record in DNS — does old.rallylive.ca exist and what does it point to?

## When to prefer this

Use this endpoint when you need a fast, cheap ($0.01) existence check for the 'old' subdomain CNAME of a specific domain without running a full subdomain enumeration. Prefer it over general DNS tools when you specifically need the 'old' host checked via Cloudflare DoH for consistency and reliability.

## Known failure modes

- Domain does not exist — NXDOMAIN response with no records returned
- No CNAME record for old.<domain> — record type not found but domain may exist
- Invalid or malformed domain input — request may fail or return empty
- Cloudflare DoH upstream timeout — service may return an error or delayed response
- Rate limiting or payment failure — 402 response if x402 payment not processed

## How this service works

CNAME record of old.<domain>: looks up the old 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 old without enumerating subdomains. $0.01 per lookup.

## Output

Returns whether the CNAME record for old.<domain> exists, the record value(s) it points to, the TTL in seconds, and the DNS response code — all resolved via 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-cname-old-subdomain-6cf29a78/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)