# DNS A Record Lookup for assets Subdomain via Cloudflare DoH

> DNS A Record Lookup for assets Subdomain via Cloudflare DoH 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).

Resolves the A record for the assets.<domain> subdomain using Cloudflare DNS over HTTPS, returning existence status, IP records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/assets/a?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-a-record-lookup-for-assets-subdomain-via-cloudflare-doh-83110bcf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RAPvEp4JfKD4FTW_Coi4I

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-assets-subdomain-via-cloudflare-doh-83110bcf
```

Example prompt: Can you check if the assets subdomain exists for example.com and tell me what IP address it resolves to and its TTL?

## When to prefer this

Use this endpoint when you need a quick, targeted existence check and IP resolution specifically for the assets subdomain of a given domain, without enumerating all subdomains. It is ideal for infrastructure audits, pre-deployment checks, or security recon where you want to confirm whether a domain serves static assets from a dedicated host. Prefer this over generic A record lookups when the subdomain of interest is specifically 'assets'.

## Known failure modes

- Domain does not exist — NXDOMAIN response returned with no records
- assets subdomain not configured — no A record found for assets.<domain>
- Invalid domain input — malformed domain name causes lookup failure
- Cloudflare DoH upstream timeout or outage — no response or error returned
- Network connectivity issue between service and Cloudflare DoH resolver

## How this service works

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

## Output

Returns whether the assets.<domain> subdomain exists, its A record IP address(es), the TTL of the record, and the DNS response code indicating resolution success or failure.

## 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-assets-subdomain-via-cloudflare-doh-83110bcf/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)