# Domain Availability Checker (`onescales/domain-availability-checker`) Actor

Check domain availability in bulk using RDAP/WHOIS lookups. Get instant availability status, registrar info, and method for hundreds of domains at once.

- **URL**: https://apify.com/onescales/domain-availability-checker.md
- **Developed by:** [One Scales](https://apify.com/onescales) (community)
- **Categories:** Developer tools, SEO tools, Other
- **Stats:** 2 total users, 1 monthly users, 100.0% runs succeeded, 4 bookmarks
- **User rating**: 5.00 out of 5 stars

## Pricing

Pay per usage

This Actor is paid per platform usage. The Actor is free to use, and you only pay for the Apify platform usage, which gets cheaper the higher subscription plan you have.

Learn more: https://docs.apify.com/platform/actors/running/actors-in-store#pay-per-usage

## What's an Apify Actor?

Actors are web data automations that power AI and operations. They run on the Apify platform to scrape websites, process data, connect APIs, and automate workflows.
In Batch mode, an Actor accepts a well-defined JSON input, performs an action which can take anything from a few seconds to a few hours,
and optionally produces a well-defined JSON output, datasets with results, or files in key-value store.
In Standby mode, an Actor provides a web server which can be used as a website, API, or an MCP server.
Actors are written with capital "A".

## How to integrate an Actor?

If asked about integration, you help developers integrate Actors into their projects.
You adapt to their stack and deliver integrations that are safe, well-documented, and production-ready.
The best way to integrate Actors is as follows.

- **AI agents and MCP clients** — the [Apify MCP server](https://docs.apify.com/integrations/mcp.md) at `https://mcp.apify.com` (remote, streamable HTTP, OAuth on first use).
- **Agentic workflows and local Actor development** — [Agent Skills](https://apify.com/.well-known/agent-skills/index.json) with the [Apify CLI](https://docs.apify.com/cli/docs.md): `npm install -g apify-cli`, then `apify login`.
- **JavaScript/TypeScript projects** — the official [JS/TS client](https://docs.apify.com/api/client/js/docs.md): `npm install apify-client`.
- **Python projects** — the official [Python client](https://docs.apify.com/api/client/python/docs.md): `pip install apify-client`.
- **Any other language** — the [REST API](https://docs.apify.com/api/v2.md).

For usage examples, see the [API](#api) section below.

For more details, see Apify documentation as [Markdown index](https://docs.apify.com/llms.txt) and [Markdown full-text](https://docs.apify.com/llms-full.txt).

# README

**Check domain availability in bulk with a single click.** Give it a list of full domain names and it returns a clean table showing whether each one is available for registration, which registrar holds it if taken, and how the result was determined.

No sign-ups, no API keys, no third-party services required. Paste your domains, click Start, and download your results.

***

### Features

- **RDAP-first, WHOIS-fallback lookups** — uses the modern, structured RDAP protocol first, with a WHOIS fallback for the handful of TLDs that don't support it yet.
- **100+ TLDs supported out of the box**, with automatic IANA lookup for anything unrecognized.
- **Registrar detection** — when a domain is taken, the registrar name is returned where publicly disclosed.
- **Bulk-friendly** — built and tuned for batches of 100-500 domains at a time: resource-aware concurrency, batched dataset writes, and a shared keep-alive connection pool keep runs fast without spiking CPU or memory.
- **Transparent method reporting** — every result shows exactly how availability was determined (`rdap-direct`, `rdap-bootstrap`, `whois`, or `dns-fallback`), so you can judge confidence at a glance.
- **Budget-aware** — respects your configured spend limit and stops cleanly when it's reached.
- **No bare-name guessing** — domains without a TLD are flagged as an error rather than silently expanded into `.com`/`.io`/etc., so results never reflect an assumption you didn't make.

***

### Use Cases

**Brand & Naming**
Check whether a shortlist of brand or product names is still available before you commit.

**Domain Portfolio Monitoring**
Track domains you're watching and get notified (via your own scheduling) the moment one frees up.

**Due Diligence**
Verify availability before recommending a name to a client or building a launch plan around it.

**Bulk Audit**
Check hundreds or thousands of domains in a single run. Export as CSV, JSON, or Excel and drop it straight into your workflow.

***

### Input

#### UI

| Field | Type | Required | Description |
|-------|------|----------|--------------|
| **Domain Names / URLs** (`domains`) | List of strings | Yes | One or more full domains or URLs to check. Must include a TLD (e.g. `mystartup.com`) — bare names are not expanded. Full URLs, protocols, `www.`, paths, and query strings are stripped automatically. |
| **Proxy Configuration** (`proxyConfiguration`) | Proxy editor | No | Proxy settings for RDAP lookups. Residential proxies (default) reduce blocking. WHOIS lookups (TCP port 43) are unaffected by proxy settings. |

#### JSON

```json
{
  "domains": [
    "example.com",
    "https://www.google.com",
    "openai.org",
    "my-startup.co.uk"
  ],
  "proxyConfiguration": {
    "useApifyProxy": true,
    "apifyProxyGroups": ["RESIDENTIAL"]
  }
}
```

***

### Output

#### UI

Results appear as a table in the Apify Console with one row per domain:

| Column | Description |
|--------|--------------|
| **Domain Name** | The normalized domain (protocol, `www`, and paths stripped) |
| **Available** | `Yes`, `No`, or `Unknown` (if the lookup was inconclusive) |
| **Status** | `success` or `error: <reason>` |
| **Method** | How availability was determined: `rdap-direct`, `rdap-bootstrap`, `whois`, or `dns-fallback` |
| **Registrar** | Registrar name if taken and disclosed, otherwise `N/A` |

Exportable directly from the Console as CSV, JSON, or Excel.

#### JSON

```json
[
  {
    "domainName": "example.com",
    "available": "No",
    "status": "success",
    "method": "rdap-direct",
    "registrar": "MarkMonitor Inc."
  },
  {
    "domainName": "some-definitely-unregistered-name-12345.com",
    "available": "Yes",
    "status": "success",
    "method": "rdap-direct",
    "registrar": "N/A"
  },
  {
    "domainName": "mystartup",
    "available": "Unknown",
    "status": "error: missing TLD (bare names are not auto-expanded)",
    "method": "none",
    "registrar": "N/A"
  }
]
```

***

### Support

**Need help or want a feature added?**

**[Contact Support — Fill out this quick form](https://docs.google.com/forms/d/e/1FAIpQLSfsKyzZ3nRED7mML47I4LAfNh_mBwkuFMp1FgYYJ4AkDRgaRw/viewform?usp=dialog)**

We respond quickly and are happy to add TLD support, new output fields, or custom integrations.

***

*Built with care by One Scales Inc.*

***

`domain availability` `domain checker` `domain lookup` `domain` `whois` `rdap` `dns` `lookup` `domain-availability` `domain-checker` `bulk` `brand-check` `domain-registration` `domain-lookup` `tld` `due-diligence`

# Actor input Schema

## `domains` (type: `array`):

Enter one or more full domains or URLs to check (must include a TLD, e.g. mystartup.com). Bare names without a TLD are not expanded automatically. Supports plain domains, full URLs, or any mix.

## `proxyConfiguration` (type: `object`):

Proxy settings for RDAP lookups. Residential proxies reduce blocking on RDAP requests. Note: WHOIS lookups (TCP port 43) are unaffected by proxy settings.

## Actor input object example

```json
{
  "domains": [
    "example.com",
    "google.com",
    "some-definitely-unregistered-name-12345.com"
  ],
  "proxyConfiguration": {
    "useApifyProxy": true,
    "apifyProxyGroups": [
      "RESIDENTIAL"
    ]
  }
}
```

# Actor output Schema

## `domainResults` (type: `string`):

All domains with their availability status, lookup method, and registrar

# API

You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup.

## JavaScript example

```javascript
import { ApifyClient } from 'apify-client';

// Initialize the ApifyClient with your Apify API token
// Replace the '<YOUR_API_TOKEN>' with your token
const client = new ApifyClient({
    token: '<YOUR_API_TOKEN>',
});

// Prepare Actor input
const input = {
    "domains": [
        "example.com",
        "google.com",
        "some-definitely-unregistered-name-12345.com"
    ],
    "proxyConfiguration": {
        "useApifyProxy": true,
        "apifyProxyGroups": [
            "RESIDENTIAL"
        ]
    }
};

// Run the Actor and wait for it to finish
const run = await client.actor("onescales/domain-availability-checker").call(input);

// Fetch and print Actor results from the run's dataset (if any)
console.log('Results from dataset');
console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`);
const { items } = await client.dataset(run.defaultDatasetId).listItems();
items.forEach((item) => {
    console.dir(item);
});

// 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docs

```

## Python example

```python
from apify_client import ApifyClient

# Initialize the ApifyClient with your Apify API token
# Replace '<YOUR_API_TOKEN>' with your token.
client = ApifyClient("<YOUR_API_TOKEN>")

# Prepare the Actor input
run_input = {
    "domains": [
        "example.com",
        "google.com",
        "some-definitely-unregistered-name-12345.com",
    ],
    "proxyConfiguration": {
        "useApifyProxy": True,
        "apifyProxyGroups": ["RESIDENTIAL"],
    },
}

# Run the Actor and wait for it to finish
run = client.actor("onescales/domain-availability-checker").call(run_input=run_input)

# Fetch and print Actor results from the run's dataset (if there are any)
print("💾 Check your data here: https://console.apify.com/storage/datasets/" + run["defaultDatasetId"])
for item in client.dataset(run["defaultDatasetId"]).iterate_items():
    print(item)

# 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start

```

## CLI example

```bash
echo '{
  "domains": [
    "example.com",
    "google.com",
    "some-definitely-unregistered-name-12345.com"
  ],
  "proxyConfiguration": {
    "useApifyProxy": true,
    "apifyProxyGroups": [
      "RESIDENTIAL"
    ]
  }
}' |
apify call onescales/domain-availability-checker --silent --output-dataset

```

## MCP server setup

```json
{
    "mcpServers": {
        "apify": {
            "command": "npx",
            "args": [
                "mcp-remote",
                "https://mcp.apify.com/?tools=onescales/domain-availability-checker",
                "--header",
                "Authorization: Bearer <YOUR_API_TOKEN>"
            ]
        }
    }
}

```

## OpenAPI specification

Download the OpenAPI definition: https://api.apify.com/v2/actors/Qsu1jab4ZMibQEn8H/builds/6Ju7FIOCoXybqKmrn/openapi.json