WHOIS is a protocol that is widely used for querying databases in order to determine the registrant or assignee of a domain name or IP address (range). In its simplest form, building a small PHP script to query the appropriate WHOIS server and outputting readable information is quite simple, yet complex solutions are usually required to extract full functionality from the WHOIS system.
Below is a very simple script to simply output the registrant of a domain name stored in WHOIS records. There’s minimal security, it doesn’t do much other than check the registrant, it’s poorly coded and it’s not very useful… but it will provide a list of servers and a function or two that may be of use.
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