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Look up domain WHOIS registration information via command line to retrieve key data like the owner, registrar, and expiration date.
WHOIS is a query and response protocol used to query databases storing registered users or assignees of Internet resources such as domain names, IP address blocks, or autonomous systems. The protocol stores and delivers database content in a human-readable format.
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When you want to find out who owns a domain, when it was registered, or if it's about to expire, manual searching can be time-consuming. This tool sends standard query requests to the WHOIS servers designated by global domain registries, directly returning the raw registration records for that domain. WHOIS is a standard protocol used to query domain registration information. This tool acts as a client following this protocol, and its output typically includes key fields such as the domain owner, registrar, creation date, expiration date, and name servers (DNS).
example.com or example.cn.Q: What is the difference between "Registrar" and "Registrant" in WHOIS lookup results?
The "Registrar" is a company accredited by ICANN or a national domain management authority that directly provides domain registration services to users (e.g., GoDaddy, Alibaba Cloud). The "Registrant" is the actual owner of the domain, whose contact information may be hidden due to privacy protection services.
Q: Why can't I find detailed information for some .com domains?
This happens because the domain owner has enabled WHOIS privacy protection. In this case, fields like the registrant's name, email, and phone number in the lookup results are replaced by proxy information provided by the registrar, which is completely normal.
Please ensure the domain name format you enter is correct (e.g., "example.com"). WHOIS data is maintained by individual registries, and updates may experience delays ranging from a few hours to several days. Information such as the "Expiration Date" is not absolutely real-time. The lookup results from this tool are for reference only and should not be used in serious scenarios such as legal evidence. Frequent and massive automated query requests may be rate-limited by the target servers.
For network administrators or security researchers, WHOIS lookups are the first step in network asset mapping and tracing responsible parties. Please note that WHOIS servers and data formats vary across different top-level domains (TLDs) like .com, .net, .cn, and .io. For example, the record structure returned when querying google.com (which typically includes fields like "Domain Name" and "Creation Date") will differ from the structure returned for a Chinese ccTLD like baidu.cn (which may include fields like "Sponsor Organization"). When interpreting results, you need to consider the field definitions of the corresponding registry. Before conducting bulk domain information collection, be sure to evaluate the rate limits of the target servers and comply with relevant laws and regulations.