# DNS CNAME Lookup for backup Subdomain

> DNS CNAME Lookup for backup 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 record for the backup.<domain> subdomain via Cloudflare DNS-over-HTTPS and reports whether it exists, its records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/backup/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-lookup-for-backup-subdomain-781d88c8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RO8zeuCr3iNrIOKYiS9V6

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-backup-subdomain-781d88c8
```

Example prompt: Can you check if backup.rallylive.ca has a CNAME record — tell me what it points to and what the TTL is?

## When to prefer this

Use this endpoint when you need a quick, targeted existence check for the backup subdomain of a specific domain without doing broad subdomain enumeration. Ideal for infrastructure auditing, pre-migration checks, or verifying backup host DNS configuration. Prefer this over general DNS tools when you specifically need CNAME data for the backup host and want a simple pass/fail existence result with TTL.

## Known failure modes

- Domain does not exist — returns no record found
- backup subdomain has no CNAME record — returns existence: false
- DNS resolution timeout from Cloudflare DoH — may return error
- Malformed domain input — may result in invalid query or error response
- Domain has A/AAAA record instead of CNAME — CNAME lookup returns no result

## How this service works

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

## Output

Returns whether the backup.<domain> CNAME record exists, the CNAME target hostname it resolves to, the TTL value, and the full DNS record details as retrieved 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-lookup-for-backup-subdomain-781d88c8/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)