# dns-aaaa-mx-subdomain

> dns-aaaa-mx-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 mx.<domain> subdomain via Cloudflare DNS over HTTPS and returns existence status, records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/mx/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-mx-subdomain-8dbf30e5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_76Q7O5dgjPnL3AHNGGv2a

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-mx-subdomain-8dbf30e5
```

Example prompt: Can you check if mx.example.com has an IPv6 AAAA record in DNS — I want to know if it exists, what address it resolves to, and what the TTL is?

## When to prefer this

Use this endpoint when you need a quick, targeted IPv6 DNS existence check specifically for the mx subdomain of a domain, without needing to enumerate all subdomains. Prefer this over general DNS tools when you want Cloudflare DoH resolution specifically and need a low-cost ($0.01) per-lookup API with a structured response. Ideal for email infrastructure audits, deliverability checks, and IPv6 readiness validation focused on the MX host.

## Known failure modes

- Domain does not exist — returns no records found
- mx.<domain> subdomain has no AAAA record (only A record) — returns empty result
- Invalid or malformed domain input — may return error or empty response
- Cloudflare DoH service outage — lookup fails
- Network timeout reaching DoH resolver

## How this service works

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

## Output

Returns whether the AAAA record for mx.<domain> exists, the IPv6 address(es) in the record, and the TTL value — sourced from 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-mx-subdomain-8dbf30e5/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)