# DNS AAAA Record Lookup for mail Subdomain

> DNS AAAA Record Lookup for mail 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 IPv6 (AAAA) DNS record for the mail subdomain of a given domain using Cloudflare DNS over HTTPS, returning existence status, records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/mail/aaaa?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-aaaa-record-lookup-for-mail-subdomain-a66f1c5a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xH3Wny_UT1ZyEXKxEdnez

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-record-lookup-for-mail-subdomain-a66f1c5a
```

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

## When to prefer this

Choose this endpoint when you specifically need the IPv6 (AAAA) DNS record for the mail subdomain of a domain, using Cloudflare's DoH resolver. Prefer it over generic DNS tools when you want a quick, targeted existence check for the mail host without enumerating all subdomains. Use it for email infrastructure audits, IPv6 reachability checks, or domain intelligence gathering where Cloudflare's resolver behavior is desired.

## Known failure modes

- Domain does not have a mail subdomain — returns NXDOMAIN or empty records
- Invalid or malformed domain input — may return error or empty response
- Cloudflare DoH service unavailable — upstream DNS resolution failure
- Domain exists but mail subdomain has no AAAA record (only A record) — returns empty AAAA result
- Network timeout contacting Cloudflare DoH endpoint

## How this service works

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

## Output

Returns whether the AAAA record for mail.<domain> exists, the resolved IPv6 address(es), the TTL value, and the DNS response code (e.g. NOERROR or NXDOMAIN), as answered by Cloudflare DoH.

## 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-record-lookup-for-mail-subdomain-a66f1c5a/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)