# DNS A Record Lookup for forum Subdomain

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

Looks up the IPv4 A record for the forum.<domain> subdomain using Cloudflare DNS-over-HTTPS and reports existence, records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/forum/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-forum-subdomain-835bfe5d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KkZ9anLw8zLDhF0ovnkuF

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-forum-subdomain-835bfe5d
```

Example prompt: Can you check whether the forum subdomain exists for discourse.org — specifically look up the A record for forum.discourse.org and tell me if it resolves and what IP it points to?

## When to prefer this

Use this endpoint when you need a targeted, single-subdomain existence check for the 'forum' host under a given domain without enumerating all subdomains. Prefer this over general DNS tools when you specifically want to confirm whether a domain runs a forum at the standard forum.<domain> convention and need IPv4 (A record) resolution via Cloudflare DoH for reliability and privacy.

## Known failure modes

- Domain does not exist — no DNS records returned
- forum subdomain not configured — NXDOMAIN or empty answer
- Cloudflare DoH service unreachable — upstream timeout or error
- Malformed domain input causes query failure
- Rate limiting or payment failure for the $0.01 per lookup fee

## How this service works

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

## Output

Returns whether the forum.<domain> A record exists, the resolved IPv4 address(es), and the TTL of the DNS record. If the subdomain does not exist, reports that it was not 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-forum-subdomain-835bfe5d/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)