# DNS A Record Lookup for dev Subdomain

> DNS A Record Lookup for dev 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).

Looks up the A (IPv4) record for the dev.<domain> subdomain via Cloudflare DNS over HTTPS and returns whether it exists, its IP addresses, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/dev/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-dev-subdomain-bad7a07d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_F7bHn8WUEbpttRO56TT84

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-dev-subdomain-bad7a07d
```

Example prompt: Can you check whether example.com has a dev subdomain set up — does dev.example.com resolve to an IP address, and if so what is it and what's the TTL?

## When to prefer this

Use this endpoint when you need a quick, targeted existence check for the dev subdomain of a specific domain without enumerating all subdomains. Prefer it over full DNS enumeration tools when you only care about whether a dev host exists and its IPv4 address. Useful for infrastructure audits, competitor research, or pre-deployment checks at low cost ($0.01 per lookup).

## Known failure modes

- Domain does not exist — returns NXDOMAIN with no records
- dev subdomain not configured — returns NXDOMAIN for that specific host
- Malformed domain input — request may fail or return an error
- Cloudflare DoH upstream timeout — may return a timeout or server error
- Rate limiting if called excessively — may return HTTP 429

## How this service works

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

## Output

Returns whether the dev.<domain> subdomain exists in DNS, its A records (IPv4 addresses), the TTL value, and the DNS response code (e.g. NOERROR or NXDOMAIN).

## 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-dev-subdomain-bad7a07d/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)