This script performs bulk reverse WHOIS lookups for company names from an input file, queries the WhoisXML API to retrieve associated domain names, and saves the results in a structured JSON format.

whoisxml-reverse-whois.py

import requests
import json

# API Key
api_key = "<ENTER_API_KEY>"
url = "https://reverse-whois.whoisxmlapi.com/api/v2"

# Read input list (one company per line)
with open("input.txt", "r", encoding="utf-8") as file:
    company_names = [line.strip() for line in file if line.strip()]

# Open output file
with open("output.json", "w", encoding="utf-8") as output_file:
    for company in company_names:
        print(f"Searching for: {company}")

        # Prepare payload
        payload = {
            "apiKey": api_key,
            "searchType": "current",
            "mode": "purchase",
            "basicSearchTerms": {
                "include": [company]
            }
        }

        try:
            response = requests.post(url, json=payload)
            data = response.json()

            # Structure output to include company name
            result = {
                "company_name": company,
                "domains_count": data.get("domainsCount", 0),
                "domains_list": data.get("domainsList", [])
            }

            # Write result to file (one JSON object per line)
            output_file.write(json.dumps(result) + "\n")

            print(f"Results saved for: {company}")

        except Exception as e:
            print(f"Error fetching data for {company}: {e}")

print("Done! All results saved to output.json")