Python script to perform WHOIS lookups on a list of domains

Python script to perform WHOIS lookups on a list of domains, along with explanations and considerations

import whois


def bulk_whois_lookup(domains):
    results = {}
    for domain in domains:
        try:
            whois_data = whois.whois(domain)
            results[domain] = whois_data
        except whois.parser.PywhoisError:
            results[domain] = "WHOIS data not available"
    return results


# Your domain list
domains = ["google.com", "example.org", "nonexistentdomain.net"]

# Perform WHOIS lookups
whois_results = bulk_whois_lookup(domains)

# Print the results in a user-friendly way
for domain, data in whois_results.items():
    print(f"\nWHOIS information for {domain}:")
    if isinstance(data, str):
        print(data)
    else:
        for key, value in data.items():
            print(f"{key}: {value}")

How it Works:

Import the whois library: This library provides functions to interact with WHOIS servers. Make sure you have it installed (pip install python-whois).

bulk_whois_lookup function:Takes a list of domains as input.
Iterates through each domain.
Tries to retrieve WHOIS data using whois.whois(domain).
If successful, stores the data in the results dictionary with the domain as the key.
If WHOIS data is not found, it stores the string "WHOIS data not available."
Returns the results dictionary.

Domain list: Define your list of domains.
Perform lookups: Call the bulk_whois_lookup function with your domain list.
Display results: Loop through the results dictionary and print the information for each domain in a formatted manner. If data is not available, it prints the corresponding message.

Key Considerations:

Rate Limiting: WHOIS servers might have rate limits to prevent abuse. If you're performing a large number of lookups, implement a delay between requests to avoid being blocked.
Data Parsing: The whois library attempts to parse the raw WHOIS response. However, responses can vary in format, so handle potential parsing errors gracefully.
Data Accuracy: WHOIS data is self-reported by domain registrants and may not always be accurate or complete.
Privacy Protection: Some domains have privacy protection enabled, which can mask the true owner's information.

Example Output:

WHOIS information for google.com: ... (WHOIS data for google.com) ... WHOIS information for example.org: ... (WHOIS data for example.org) ... WHOIS information for nonexistentdomain.net: WHOIS data not available

Advanced Options:

Custom Output: You can customize how you display the results. For example, save them to a CSV file, a database, or use a more structured output format (e.g., JSON).
Specific Fields: Extract only the specific fields you're interested in (e.g., registrar, expiration date).

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