---
title: "Check domain availability"
method: POST
path: "/domain/lookup"
tags: ["Domain"]
---

# Check domain availability

`POST /domain/lookup`

Checks the configured registrar for the enabled domain extensions that match a name. Send the domain name without an extension, such as `billingserv`, to check up to 50 extensions. The endpoint is limited to 30 requests per minute per client.

## Request body

- DomainLookupRequest — Search for a domain name without its extension. The API normalizes surrounding whitespace and letter casing.
  - `domain` string, required — Domain name without an extension, such as `billingserv`. Do not include `.com` or another extension.
  - `limit` integer — Maximum number of enabled extensions to check.

## Response `200`

Availability results

- DomainLookupResponse
  - `success` true, required
  - `domain` string, required — Normalized domain name that was searched.
  - `registrar` string, required — Registrar used for this availability check.
  - `results` DomainAvailabilityResult[], required
    - `domain` string, required — Complete domain name checked by the registrar.
    - `extension` string, required — Domain extension, without a leading dot.
    - `available` boolean, required
    - `premium` boolean, required — Whether the registrar marked the domain as premium.

## Other responses

- `401` — Missing or invalid API key
- `403` — Authenticated key does not have permission for this endpoint
- `422` — Validation error
- `429` — Too many domain availability requests. Retry after the rate limit window.

---

[API](https://skmtc.net/b-cdn/apis/billingserv-api-v2.md) · [All operations](https://skmtc.net/b-cdn/apis/billingserv-api-v2/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/b-cdn/billingserv-api-v2/revisions/76cfbed5eb40/schema)