# dns-aaaa-app-subdomain

> dns-aaaa-app-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 AAAA (IPv6) DNS record for the app.<domain> subdomain via Cloudflare DNS over HTTPS and returns whether it exists, its records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/app/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-app-subdomain-b9506777
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4nf52lsuOHyo5VH-bU-PS

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-app-subdomain-b9506777
```

Example prompt: Can you check whether app.rallylive.ca has an IPv6 DNS record — does it exist, and if so what are the AAAA records and TTL?

## When to prefer this

Choose this endpoint when you need a quick, targeted IPv6 DNS existence check specifically for the 'app' subdomain of a given domain, without enumerating all subdomains. It is ideal for infrastructure validation, deployment readiness checks, and IPv6 connectivity diagnostics. Prefer this over generic DNS tools when you want a pay-per-lookup, no-setup resolution via Cloudflare's trusted DoH resolver.

## Known failure modes

- Domain does not exist — NXDOMAIN response, no records returned
- app subdomain exists but has no AAAA record — empty record set returned
- Invalid or malformed domain input — request error
- Cloudflare DoH resolver unreachable — upstream timeout or connectivity failure
- Rate limiting or payment failure — request rejected before DNS query is made

## How this service works

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

## Output

Returns whether the app.<domain> subdomain exists in DNS, its AAAA (IPv6) records and associated values, the TTL, and the DNS response code — all sourced from Cloudflare's DNS over HTTPS resolver.

## 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-app-subdomain-b9506777/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)