# DNS A Record Lookup for pop Subdomain via Cloudflare DoH

> DNS A Record Lookup for pop 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).

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

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/pop/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-pop-subdomain-via-cloudflare-doh-b300dc60
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ta7DNlVTv2juUkuZx0Gib

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-pop-subdomain-via-cloudflare-doh-b300dc60
```

Example prompt: Check whether pop.rallylive.ca exists in DNS — I need to know if there's an A record for that pop subdomain, what IP it points to, and its TTL.

## When to prefer this

Use this endpoint when you need a quick, targeted existence check for the pop subdomain specifically (e.g. mail retrieval hosts), without enumerating all subdomains. Prefer this over generic DNS tools when you want a low-cost ($0.01) single-host check via a reliable resolver like Cloudflare, and when you only need A (IPv4) records for pop.<domain>.

## Known failure modes

- Domain does not exist — returns NXDOMAIN response code with no records
- pop subdomain not configured — returns NXDOMAIN or empty answer section
- Invalid domain format supplied — may return error or empty result
- Cloudflare DoH unreachable — upstream resolver timeout
- Rate limiting or payment failure — request rejected before DNS query is made

## How this service works

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

## Output

Returns whether the pop.<domain> A record exists, the resolved IPv4 address(es), the TTL value, and the DNS response code (e.g. NOERROR or NXDOMAIN), as answered by 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-a-record-lookup-for-pop-subdomain-via-cloudflare-doh-b300dc60/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)