If you do much work with domain names you’re probably familiar with the whois system, at least the pretty web-frontend that is. It’s really useful for more than looking up who owns a domain and what the associated details are. If you access a real whois server such as the Verisign-GRS whois you can look up things like what IP is associated with a given nameserver or details about a specific registrar. Of course this all seems rather unimportant until you’re trying to track down why DNS records aren’t resolving correctly only to find out that the ns record isn’t pointing at the correct server.
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