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I've used it already today. Was troubleshooting a VPN which is pointing to a dynamic dns address, and to check the HQ device was resolving the address to the correct IP I did a quick nslookup and found out it wasn't, and went from there.
Problems with email usually involve nslookup with the type set to mx to query mx record for a domain. Similarly the other records for the domain can be queried.
As said, can be used to check DNS connectivity too.
It's a helpful tool.
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