# DNS CNAME Lookup for autodiscover Subdomain

> DNS CNAME Lookup for autodiscover 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 the autodiscover.<domain> subdomain via Cloudflare DoH and reports its existence, records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/autodiscover/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-autodiscover-subdomain-5acc731e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EEjYq2q3ScCzdeUqQ5s8x

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-autodiscover-subdomain-5acc731e
```

Example prompt: Check if autodiscover.contoso.com has a CNAME record configured — I want to know if it exists, what it points to, and what the TTL is.

## When to prefer this

Choose this endpoint when you need a quick, targeted check on whether a specific domain has an autodiscover CNAME configured for email client autoconfiguration, without performing broader subdomain enumeration. Ideal for email migration pre-checks, IT audits, or verifying Exchange/Office 365 DNS setup.

## Known failure modes

- Domain does not exist — NXDOMAIN response with no records returned
- Autodiscover subdomain has no CNAME record (may have A or other record types instead)
- Cloudflare DoH resolver is temporarily unreachable
- Invalid or malformed domain input
- Payment not completed — x402 payment required before lookup proceeds

## How this service works

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

## Output

Returns whether the autodiscover.<domain> CNAME record exists, the CNAME target value(s), and the TTL of the record as 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-lookup-for-autodiscover-subdomain-5acc731e/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)