This Apify Actor checks whether domain names appear to be registered or available using the instant.who.sb API. Results are pushed to the default dataset so you can download them as JSON, CSV, or other supported formats.

Input

Provide domains either as a list (domains) or as a single value (domain). Extra tuning options let you control concurrency, retries, and the WHO API endpoint.

{
  "domains": [
    "example.com",
    "mynewstartup.io"
  ],
  "maxConcurrent": 5,
  "maxRetries": 3
}

Input fields

domains (array of strings, optional): Domain names to check. If omitted, the actor checks domain instead.
domain (string, optional): Single domain to check when you do not provide domains.
maxConcurrent (integer, default 5): Maximum number of concurrent WHO API requests.
maxRetries (integer, default 3): Number of retry attempts for failed checks.
apiUrl (string, default https://instant.who.sb/api/v1/check): Override the WHO API endpoint if needed.

Output dataset

Each processed domain produces one record similar to:

{
  "domain": "example.com",
  "status": "registered",
  "existed": "yes",
  "registered": "1995-08-13T04:00:00.000Z",
  "expires": "2025-08-12T04:00:00.000Z",
  "check_time": "2024-01-05T11:22:33.456789+00:00"
}

The status field is registered, available, or unknown when the WHO API does not provide enough information. Failed lookups include status: "error" and an error message.

Notes

The actor respects the retry limits you set; the WHO API may still rate-limit frequent requests.
When a domain lookup returns SSE payloads with multiple messages, the actor aggregates the relevant metadata (registered, expires, existed).

Development

Install dependencies and run the actor locally:

pip install -r requirements.txt
apify run

Set environment variables (such as proxy credentials) via the Apify UI or .env file as needed.

On this page

Domain Availability Checker Actor

Share Actor:

Domain Registration Date Checker

tuningsearch/domain-registration-time

🔥 Only $1.0 per 1,000 domain queries 🔥 **CHEAPEST** Domain Registration Date Extractor & WHOIS Lookup Tool

tuningsearch

Company domain finder

unlimitedleadtestinbox/domainapify

Find company domain url from company name with our company domain finder with bulk or individual search.

unli

5.0

GoDaddy Auctions Scraper

easyapi/godaddy-auctions-scraper

Unlock valuable domain auction data from GoDaddy with ease! This Actor scrapes detailed information on domain listings, including prices, traffic, and backlinks. Perfect for domain investors, market researchers, and trend analysts. Dive into domain market insights today!

EasyApi

5.0

Advanced Website Domain Name Validator

saswave/advanced-website-domain-name-validator

Advanced domain scraper. Determine if a domain is still valid or has moved. We test multiple scenario before flagging the domain as invalid. Extract technologies stack, social account, emails

SASWAVE

Moz Domain Authority Checker

jdtpnjtp/moz-domain-authority-checker

The MOZ Domain Authority API provides comprehensive domain analysis and SEO metrics through a simple REST interface. Analyze any domain to retrieve critical SEO indicators including Domain Authority (DA), Page Authority

Data Collector

Domain Availability Checker

scrap3r/domain-availability-checker

Think of it as an enhanced version of traditional domain checkers, optimized for speed and reliability. Just enter your desired domain name, and get instant results on its availability and related metrics—all at lightning-fast speeds. Start checking domain availability.

Internet Scraping

Free Addresses Scraper – Find HQ Addresses From Any Domain

s-r/free-addresses-scraper---find-hq-addresses-from-any-domain

Turn any domain into complete business address data in seconds! Just provide a domain name, and our intelligent actor delivers comprehensive location data - perfect for sales teams, market researchers, and data analysts.

University Email Checker

tomas.nosek/university-email-checker

Check whether an email belongs to a university domain.

Tomas Nosek

Domain.com.au Scraper

scrapemind/Domaincomau-Scraper

Unlock Comprehensive Real Estate Data from Domain.com.au Discover a wealth of information from Domain.com.au's vast property listings. Effortlessly extract detailed descriptions, high-quality images, unique features, and essential property details.

ScrapeMind

110

5.0

Domain Expiry Hunter Premium Leads

cuepoint.ai/domain-expiry-hunter-premium-leads

Find valuable expiring domains with owner contact info. Extract WHOIS data, domain metrics, and generate high-quality leads for brokers, developers, and investors. Turn domain expiration into business opportunities