# DNS A Record Lookup for pop3 Subdomain

> DNS A Record Lookup for pop3 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 2026-10-21).

Resolves the A record for the pop3.<domain> subdomain via Cloudflare DNS over HTTPS, returning existence status, IP records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/pop3/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-pop3-subdomain-c2fa6dd9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bHqZneVhb-pk0xYcoS2FW

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-pop3-subdomain-c2fa6dd9
```

Example prompt: Check whether example.com has a pop3 subdomain configured — look up its DNS A record and tell me if it exists, what IP it resolves to, and the TTL.

## When to prefer this

Choose this endpoint when you need a quick, targeted check for whether a specific domain has a POP3 mail server host configured, without enumerating all subdomains. Ideal for email infrastructure audits, pre-migration checks, or validating mail server presence on a per-domain basis. Prefer over general DNS lookup tools when you specifically need the pop3 subdomain A record resolved via Cloudflare DoH.

## Known failure modes

- Domain not found / NXDOMAIN — pop3 subdomain does not exist for the given domain
- Invalid or malformed domain name input causing query failure
- Cloudflare DoH upstream timeout or unavailability
- Rate limiting or payment failure for the $0.01 per call fee
- Network connectivity issues between the service and Cloudflare DoH

## How this service works

A record of pop3.<domain>: looks up the pop3 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 pop3 without enumerating subdomains. $0.01 per lookup.

## Output

Returns whether the pop3.<domain> A record exists, the resolved IPv4 address(es), the TTL value in seconds, and the DNS response code. If the subdomain does not exist, indicates it is absent with appropriate NXDOMAIN or empty response details.

## 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-pop3-subdomain-c2fa6dd9/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)