Yes, Whois supports .com domains. Just like with other domain extensions, you can look up who owns a .com domain with Whois or whether certain .com domains are available. However, it should be noted that the information available during this .com domain lookup will depend on where the domain is registered; the Whois database is not an independent venture, but deals with multiple registrars that contribute information. These registrars manage different domain extension categories. For example, domain extensions are broken down into several categories: generic top-level domains (gTLD), new top-level domains (nTLD), and country code top-level domains (ccTLD). The domain extension .com (which stands for commercial) is a gTLD domain and is the most common gTLD, others include .org and .net. gTLDs are international domains and the information on these domains is handled by the Internet Corporation for Assigned Names and Numbers (ICANN "new top-level domains"). However, due to the GDPR only a limited amount of information will be made available in the .com domain WHOIS lookup search results.