# DNS A Record Lookup for sftp Subdomain

> DNS A Record Lookup for sftp 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 record of sftp.<domain> via Cloudflare DNS over HTTPS and reports whether the host exists, its IP records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/sftp/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-sftp-subdomain-69a16351
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rdaSz0Yu08Nc-CXh95iHQ

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-sftp-subdomain-69a16351
```

Example prompt: Can you check if sftp.acmecorp.com exists and what IP address it resolves to — just look up its DNS A record using Cloudflare DoH?

## When to prefer this

Use this endpoint when you need a quick, single-shot existence check for the sftp subdomain of a given domain without enumerating all subdomains. Prefer it over general DNS tools when you specifically want to verify SFTP host presence via Cloudflare DoH with a simple pay-per-use model.

## Known failure modes

- Domain does not exist — NXDOMAIN response with no records returned
- sftp subdomain not configured — empty records with NOERROR or NXDOMAIN
- Invalid domain format — malformed input may result in an error
- Cloudflare DoH unreachable — upstream resolver timeout or failure
- Payment not fulfilled — x402 payment required before lookup proceeds

## How this service works

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

## Output

Returns whether sftp.<domain> has a DNS A record, the resolved IP address(es), the TTL value, and the DNS response code indicating existence or non-existence of the host.

## 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-sftp-subdomain-69a16351/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)