# DNS CNAME Lookup for mail Subdomain via Cloudflare DoH

> DNS CNAME Lookup for mail 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 CNAME record for the mail.<domain> subdomain using Cloudflare DNS over HTTPS and returns whether it exists, its records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/mail/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-mail-subdomain-via-cloudflare-doh-fbd3ea6f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WK_ZJr-BE56IHzzg-n4Q6

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-mail-subdomain-via-cloudflare-doh-fbd3ea6f
```

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

## When to prefer this

Use this endpoint when you need a quick, targeted check of whether the mail subdomain of a specific domain has a CNAME record, without performing a full subdomain enumeration. Ideal for email infrastructure audits, domain validation workflows, or detecting third-party mail provider configurations. Prefer this over general DNS APIs when you specifically need CNAME resolution for the mail host via Cloudflare DoH.

## Known failure modes

- Domain does not exist — returns NXDOMAIN or no records found
- mail subdomain has no CNAME record (may have A/AAAA instead) — returns empty or no-record response
- Invalid domain input — may return an error or empty response
- Cloudflare DoH service temporarily unavailable — request failure
- Rate limiting or payment failure for x402 micropayment

## How this service works

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

## Output

Returns whether the CNAME record for mail.<domain> exists, the record value(s) it resolves to, and the TTL of the record as reported 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-cname-lookup-for-mail-subdomain-via-cloudflare-doh-fbd3ea6f/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)