# DNS A Record Lookup for webmail Subdomain via Cloudflare DoH

> DNS A Record Lookup for webmail 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 2026-10-22).

Looks up the A (IPv4) record for the webmail.<domain> subdomain using Cloudflare DNS over HTTPS and reports existence, IP records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/webmail/a?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dns-a-record-lookup-for-webmail-subdomain-via-cloudflare-doh-c409a1db
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eZ45Lko6Huz2gy2I3Mp5F

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-webmail-subdomain-via-cloudflare-doh-c409a1db
```

Example prompt: Can you check whether example.com has a webmail subdomain set up — look up its A record via Cloudflare DoH and tell me if it resolves and what IP it points to?

## When to prefer this

Use this endpoint when you need a fast, targeted check on whether a specific domain has a webmail subdomain configured, without running a full subdomain enumeration. Prefer it over generic DNS A lookup endpoints when you specifically want the webmail.<domain> host, and prefer it over AAAA lookup when you need IPv4 addresses only.

## Known failure modes

- Domain does not exist — NXDOMAIN response returned
- webmail subdomain not configured — no A record found
- Cloudflare DoH unavailable — upstream resolver timeout
- Invalid domain format provided — query fails
- Network error between the service and Cloudflare DoH

## How this service works

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

## Output

Returns whether the webmail.<domain> A record exists, the resolved IPv4 address(es), the TTL value, and the DNS response code. If the subdomain does not exist, indicates that no record was found.

## 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-webmail-subdomain-via-cloudflare-doh-c409a1db/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)