# dns-aaaa-mx1-subdomain

> dns-aaaa-mx1-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 AAAA (IPv6) DNS record for the mx1 subdomain of a given domain via Cloudflare DoH and reports existence, records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/mx1/aaaa?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-aaaa-mx1-subdomain-60d557dd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5zCY1iB8SH7Z4jsXVVH1P

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-aaaa-mx1-subdomain-60d557dd
```

Example prompt: Can you check if mx1.example.com has an IPv6 address by looking up its AAAA DNS record?

## When to prefer this

Use this endpoint when you specifically need to check whether the mx1 host of a domain has an IPv6 (AAAA) DNS record, such as auditing mail server IPv6 support or verifying existence of a common MX hostname without broad subdomain enumeration. Prefer this over general DNS tools when you want a targeted, low-cost single-host check via Cloudflare DoH.

## Known failure modes

- Domain does not exist or is not resolvable — returns no records found
- mx1 subdomain not present — empty result with existence flag false
- Cloudflare DoH upstream timeout or error — service may return an error response
- Invalid domain format supplied — request may fail or return empty
- NXDOMAIN response when neither domain nor mx1 subdomain is registered

## How this service works

AAAA record of mx1.<domain>: looks up the mx1 host under the domain you give (AAAA via Cloudflare DoH) and reports whether it exists, its records and TTL. Quick existence check for common hosts like mx1 without enumerating subdomains. $0.01 per lookup.

## Output

Returns whether the mx1.<domain> AAAA record exists, any IPv6 addresses found, 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-aaaa-mx1-subdomain-60d557dd/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)