Look up domain WHOIS

Return parsed WHOIS research data for a domain. The endpoint requires an authenticated caller with read:domains. Pass sourceText=true only when diagnostics require the full upstream WHOIS socket response; normal callers should use the parsed fields instead of scraping that text.

Domains & DNS WHOIS

Authentication

Required API scope: read:domains

Use Authorization: Bearer <token> for API keys. Dashboard sessions may also use hostup_session.

Context

Query Parameters

domain string required · Example: example.com

Domain name to look up. The server normalizes and punycodes the value before querying WHOIS.

sourceText boolean · Example: true

When true, include `sourceText` with the full upstream WHOIS response.

Headers

Accept Example
Content-Type Example

Responses

200 WHOIS lookup result.
domain string required · Example: example.com
available boolean required · Example: false
reason stringnull required · Example: Domain is currently registered.
registrar stringnull required · Example: Hostup AB
registrarUrl stringnull required · Example: null
registrant object | null required · Example: null
registrant.organization stringnull required · Example: null
registrant.countryCode stringnull required · Example: SE
nameservers array<string> required · Example: ["primary.ns.hostup.se","secondary.ns.hostup.se"]
dates object required
dates.registeredAt stringnull required · Example: 2017-07-16T00:00:00.000Z
dates.expiresAt stringnull required · Example: 2034-07-16T00:00:00.000Z
dates.updatedAt stringnull required · Example: 2026-05-13T00:00:00.000Z
statuses array<string> required · Example: ["active","ok"]
dnssec booleannull required · Example: true
sourceText string · Example: Domain Name: EXAMPLE.COM Registry Domain ID: 2336799_DOMAIN_COM-VRSN Registrar: Example...

Full upstream WHOIS response. Present only when `sourceText=true`.

400 Invalid request. The response body is an RFC 7807 Problem Details document.
type string · Example: https://developer.hostup.se/errors/invalid_request
title string · Example: Validation failed
status integer · Example: 400
detail string · Example: The request body failed validation.
code string · Example: invalid_request

Stable machine-readable code. Branch on this field, not on `detail`.

instance string · Example: /api/v2/orders
requestId string · Example: req_01hxa3b4c5d6e7f8g9h0j1k2m3
timestamp string · Example: 2026-04-27T12:34:56.000Z
errors array<object>

Field-level validation errors when `code` is `invalid_request`.

errors[].pointer string required · Example: /items/0/eppCode
errors[].detail string required · Example: `eppCode` is required for this transfer.
errors[].code string required · Example: missing_required
extensions object
401 Unauthorized. Authentication is required.
type string · Example: https://developer.hostup.se/errors/invalid_request
title string · Example: Validation failed
status integer · Example: 400
detail string · Example: The request body failed validation.
code string · Example: invalid_request

Stable machine-readable code. Branch on this field, not on `detail`.

instance string · Example: /api/v2/orders
requestId string · Example: req_01hxa3b4c5d6e7f8g9h0j1k2m3
timestamp string · Example: 2026-04-27T12:34:56.000Z
errors array<object>

Field-level validation errors when `code` is `invalid_request`.

errors[].pointer string required · Example: /items/0/eppCode
errors[].detail string required · Example: `eppCode` is required for this transfer.
errors[].code string required · Example: missing_required
extensions object
403 Forbidden. The caller lacks a required scope or does not own the resource.
type string · Example: https://developer.hostup.se/errors/invalid_request
title string · Example: Validation failed
status integer · Example: 400
detail string · Example: The request body failed validation.
code string · Example: invalid_request

Stable machine-readable code. Branch on this field, not on `detail`.

instance string · Example: /api/v2/orders
requestId string · Example: req_01hxa3b4c5d6e7f8g9h0j1k2m3
timestamp string · Example: 2026-04-27T12:34:56.000Z
errors array<object>

Field-level validation errors when `code` is `invalid_request`.

errors[].pointer string required · Example: /items/0/eppCode
errors[].detail string required · Example: `eppCode` is required for this transfer.
errors[].code string required · Example: missing_required
extensions object
404 Not found. The resource does not exist or is not owned by the caller.
type string · Example: https://developer.hostup.se/errors/invalid_request
title string · Example: Validation failed
status integer · Example: 400
detail string · Example: The request body failed validation.
code string · Example: invalid_request

Stable machine-readable code. Branch on this field, not on `detail`.

instance string · Example: /api/v2/orders
requestId string · Example: req_01hxa3b4c5d6e7f8g9h0j1k2m3
timestamp string · Example: 2026-04-27T12:34:56.000Z
errors array<object>

Field-level validation errors when `code` is `invalid_request`.

errors[].pointer string required · Example: /items/0/eppCode
errors[].detail string required · Example: `eppCode` is required for this transfer.
errors[].code string required · Example: missing_required
extensions object
429 Rate limited. Retry after the limit resets. 429 responses include `Retry-After` seconds plus `X-RateLimit-*` headers.
type string · Example: https://developer.hostup.se/errors/invalid_request
title string · Example: Validation failed
status integer · Example: 400
detail string · Example: The request body failed validation.
code string · Example: invalid_request

Stable machine-readable code. Branch on this field, not on `detail`.

instance string · Example: /api/v2/orders
requestId string · Example: req_01hxa3b4c5d6e7f8g9h0j1k2m3
timestamp string · Example: 2026-04-27T12:34:56.000Z
errors array<object>

Field-level validation errors when `code` is `invalid_request`.

errors[].pointer string required · Example: /items/0/eppCode
errors[].detail string required · Example: `eppCode` is required for this transfer.
errors[].code string required · Example: missing_required
extensions object
500 Internal error. Retry later or contact support if the issue persists.
type string · Example: https://developer.hostup.se/errors/invalid_request
title string · Example: Validation failed
status integer · Example: 400
detail string · Example: The request body failed validation.
code string · Example: invalid_request

Stable machine-readable code. Branch on this field, not on `detail`.

instance string · Example: /api/v2/orders
requestId string · Example: req_01hxa3b4c5d6e7f8g9h0j1k2m3
timestamp string · Example: 2026-04-27T12:34:56.000Z
errors array<object>

Field-level validation errors when `code` is `invalid_request`.

errors[].pointer string required · Example: /items/0/eppCode
errors[].detail string required · Example: `eppCode` is required for this transfer.
errors[].code string required · Example: missing_required
extensions object
GET https://cloud.hostup.se/api/v2/whois
For AI assistants
View as Markdown
cURL 
curl -X GET "https://cloud.hostup.se/api/v2/whois?domain=example.com" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Accept: application/json"
Response 
{
  "domain": "example.com",
  "available": false,
  "reason": "Domain is currently registered.",
  "registrar": "Example Registrar, LLC",
  "registrarUrl": null,
  "registrant": null,
  "nameservers": [
    "primary.ns.hostup.se",
    "secondary.ns.hostup.se"
  ],
  "dates": {
    "registeredAt": "2017-07-16T00:00:00.000Z",
    "expiresAt": "2034-07-16T00:00:00.000Z",
    "updatedAt": "2026-05-13T00:00:00.000Z"
  },
  "statuses": [
    "active",
    "ok"
  ],
  "dnssec": true,
  "sourceText": "Domain Name: EXAMPLE.COM\nRegistry Domain ID: 2336799_DOMAIN_COM-VRSN\nRegistrar: Example Registrar, LLC"
}