# A Domain That Is Not Registered

An A lookup of a domain that does not exist: rcode NXDOMAIN, with raw and values null.

Source: https://docs.deepinfo.com/reference/lookup/dns/examples/unregistered-domain/

Last updated: 2026-09-24

---
`GET https://api.deepinfo.com/v1/lookup/dns?domain=no-such-domain-deepinfo-docs.com&type=A`

An A lookup of a domain that does not exist: rcode NXDOMAIN, with raw and values null.

Example 2 of 3 in **Special Answers** · [DNS Lookup Examples](/reference/lookup/dns/examples/) · endpoint: [DNS](/reference/lookup/dns/)

Tags: `param` `domain` · `param` `type` · `value` `no-such-domain-deepinfo-docs.com` · `value` `A`

Asks for the `A` records of `no-such-domain-deepinfo-docs.com`, a domain that is not registered.

The resolver answers `NXDOMAIN` (non-existent domain) in `rcode`, and `raw` and `values` are `null`. The request itself still returns HTTP 200: check `rcode` to tell a missing name from a name without records.

Only an `NXDOMAIN` answer proves that a name does not exist. Some DNS providers, among them zones signed with DNSSEC "compact denial of existence", answer `NOERROR` without records for names that do not exist, so an empty `NOERROR` answer alone does not prove that a name exists.

## Request

| Parameter | In | Value |
|---|---|---|
| `domain` | query | `no-such-domain-deepinfo-docs.com` |
| `type` | query | `A` |

```bash
curl 'https://api.deepinfo.com/v1/lookup/dns?domain=no-such-domain-deepinfo-docs.com&type=A' \
  -H 'apikey: YOUR_API_KEY' \
  -H 'Accept: application/json'
```

## Response

### 200 · OK

`Content-Type: application/json` · `ratelimit-limit: 100000` · `ratelimit-remaining: 99997` · `ratelimit-reset: 19` · `x-ratelimit-limit-minute: 100000` · `x-ratelimit-remaining-minute: 99997` · `deepinfo-request-id: 5f0c6a8e-1b2d-4c3e-9f4a-7b8c9d0e1f2a`

```json
{
  "fqdn": "no-such-domain-deepinfo-docs.com",
  "requested_types": [
    "A"
  ],
  "responses": [
    {
      "type": "A",
      "conn_status": "success",
      "rcode": "NXDOMAIN",
      "raw": null,
      "values": null,
      "server": "8.8.8.8"
    }
  ],
  "servers": [
    "8.8.8.8"
  ],
  "check_date": "2026-09-24T07:49:41Z"
}
```

## Related Examples

- [A Name Without Records of the Requested Type](/reference/lookup/dns/examples/no-records/)
- [A Records of a Domain](/reference/lookup/dns/examples/type-a/)
- [Null MX: A Domain That Accepts No Mail](/reference/lookup/dns/examples/null-mx/)
- [A Host Name Behind a CNAME](/reference/lookup/dns/examples/www-a-cname/)
- [Five Types at Once](/reference/lookup/dns/examples/five-types/)
- [Mail Setup: MX and TXT](/reference/lookup/dns/examples/types-mx-txt/)