Look up domain WHOIS

GET /api/v2/whois

Return parsed WHOIS research data for a domain.

The endpoint requires an authenticated caller with read:domains.

Results are cached for up to 5 minutes, so recent registry changes may not appear immediately.

Pass sourceText=true only when diagnostics require the raw response from the upstream WHOIS server; normal callers should use the parsed fields instead of scraping that text.

Domains & DNS WHOIS

Authentication

Required API scope: read:domains

Authenticate with an API key in the Authorization: Bearer <token> header.

Context

Related endpoints

GET /api/v2/domains List domains GET /api/v2/dns-zones List DNS zones GET /api/v2/domains/{id} Get domain details

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 · default: false · Example: true

When true, include sourceText with the raw response from the upstream WHOIS server when one is available. sourceText is still omitted when the registry returns no raw text or the domain is unregistered.

Headers

Authorization Bearer <token>

Accept application/json

Responses

200 WHOIS lookup result. 11 fields

domain string required · Example: example.com

available boolean required · Example: false

reason string · nullable required · Example: Domain is currently registered.

registrar string · nullable required · Example: Hostup AB

registrarUrl string · nullable required · Example: null

registrant object | null required · Example: null

registrant.organization string · nullable required · Example: null

Nullable: may be null when not applicable.

registrant.countryCode string · nullable required · Example: SE

Nullable: may be null when not applicable.

nameservers array<string> required · Example: ["primary.ns.hostup.se","secondary.ns.hostup.se"]

dates object required

dates.registeredAt string · nullable required · Example: 2017-07-16T00:00:00.000Z

Nullable: may be null when not applicable.

dates.expiresAt string · nullable required · Example: 2034-07-16T00:00:00.000Z

Nullable: may be null when not applicable.

dates.updatedAt string · nullable required · Example: 2026-05-13T00:00:00.000Z

Nullable: may be null when not applicable.

statuses array<string> required · Example: ["active","ok"]

dnssec boolean · nullable required · Example: true

sourceText string · Example:

Domain Name: EXAMPLE.COM
Registry Domain ID: 2336799_DOMAIN_COM-VRSN
Registrar: Example...

Raw response from the upstream WHOIS server. May be present when sourceText=true; omitted when the registry returns no raw text or the domain is unregistered.

400 Invalid request. The response body is an RFC 7807 Problem Details document. 10 fields

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. 10 fields

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. 10 fields

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. 10 fields

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

422 TLD not supported (tld_not_supported): WHOIS lookup is not available for this domain's TLD. 10 fields

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. 10 fields

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. 10 fields

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

502 Upstream failure (upstream_failed): the upstream WHOIS server did not respond. Retry in a moment. 10 fields

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"
}

{
  "type": "object",
  "properties": {
    "domain": {
      "type": "string"
    },
    "available": {
      "type": "boolean"
    },
    "reason": {
      "type": "string",
      "nullable": true
    },
    "registrar": {
      "type": "string",
      "nullable": true
    },
    "registrarUrl": {
      "type": "string",
      "nullable": true
    },
    "registrant": {
      "type": "object | null",
      "properties": {
        "organization": {
          "type": "string",
          "nullable": true
        },
        "countryCode": {
          "type": "string",
          "nullable": true
        }
      }
    },
    "nameservers": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "dates": {
      "type": "object",
      "properties": {
        "registeredAt": {
          "type": "string",
          "nullable": true
        },
        "expiresAt": {
          "type": "string",
          "nullable": true
        },
        "updatedAt": {
          "type": "string",
          "nullable": true
        }
      }
    },
    "statuses": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "dnssec": {
      "type": "boolean",
      "nullable": true
    },
    "sourceText": {
      "type": "string",
      "description": "Raw response from the upstream WHOIS server. May be present when `sourceText=true`; omitted when the registry returns no raw text or the domain is unregistered."
    }
  }
}