# DNS A Record Lookup for internal.<domain> Subdomain

> DNS A Record Lookup for internal.<domain> 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 A record of the 'internal' subdomain under a given domain via Cloudflare DNS over HTTPS, returning whether the host exists, its IP records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/internal/a?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-a-record-lookup-for-internal-domain-subdomain-2541ffcc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7EXvapiQ8PKomMWbmx-_r

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-a-record-lookup-for-internal-domain-subdomain-2541ffcc
```

Example prompt: Can you check if the 'internal' subdomain of acme.com exists in DNS and tell me what IP it resolves to and its TTL?

## When to prefer this

Use this endpoint when you need a quick, single-shot existence and resolution check specifically for the 'internal' subdomain of a given domain, without needing to enumerate all subdomains. Prefer it over general DNS A record endpoints when the target host is known to be 'internal' and you want a pre-scoped, cheap lookup via Cloudflare DoH.

## Known failure modes

- Domain not found / NXDOMAIN — internal subdomain does not exist under the given domain
- Invalid domain input — malformed domain name rejected
- Cloudflare DoH upstream timeout or error — DNS resolution fails
- Payment failure — x402 micropayment not completed, request not processed

## How this service works

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

## Output

Returns whether the 'internal.<domain>' hostname exists in DNS, its A record IP address(es), the TTL value, and the DNS response code — all 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-a-record-lookup-for-internal-domain-subdomain-2541ffcc/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)