- MxToolbox
MxToolbox is a comprehensive tool that allows you to look up DNS and WHOIS records for any website. It’s particularly useful for diagnosing DNS issues and checking mail server configurations.
2. HackerTarget’s Subdomain Finder
This online tool helps you enumerate subdomains of a domain, which is valuable during the discovery phase of a security assessment or penetration test.
3. Dotcom-Tools’ DNS Lookup
Dotcom-Tools offers a free DNS Trace Test that lets you test your domain’s DNS records from various global locations, providing insights into how your DNS records are propagated worldwide.