# DNS A Record Lookup for voip Subdomain via Cloudflare DoH

> DNS A Record Lookup for voip 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 2026-10-20).

Looks up the A record of the voip.<domain> subdomain using Cloudflare DNS over HTTPS and returns existence status, IP records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/voip/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-voip-subdomain-via-cloudflare-doh-b54df315
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sQnRHZuJW0jpryGdMmpTV

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-voip-subdomain-via-cloudflare-doh-b54df315
```

Example prompt: Can you check if example.com has a voip subdomain set up — I want to know if voip.example.com resolves to any IP address and what its TTL is?

## When to prefer this

Use this endpoint when you need a quick, targeted existence and resolution check specifically for the voip subdomain of a domain without enumerating all subdomains. Prefer this over full subdomain enumeration tools when you only need to confirm VoIP DNS presence. It is cost-effective at $0.01 per lookup and uses Cloudflare DoH for reliable, low-latency resolution.

## Known failure modes

- Domain does not exist — returns NXDOMAIN response code with no records
- voip subdomain not configured — NXDOMAIN with empty records
- Network or DoH resolver timeout — upstream Cloudflare error
- Invalid domain input — malformed query error
- Payment not processed — 402 response before lookup is performed

## How this service works

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

## Output

Returns whether voip.<domain> exists as an A record, the resolved IPv4 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-a-record-lookup-for-voip-subdomain-via-cloudflare-doh-b54df315/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)