Reverse nslookup Command

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How do I use nslookup command line administrative tool for testing and troubleshooting DNS servers including reverse lookup under UNIX or Windows operating systems? How do I look up an IP address of a domain or host on a network using nslookup command?

nslookup / host Dns Client Testing Command Not Found on Debian / Ubuntu Linux

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Q. I’m not able to run nslookup or host command under Debian or Ubuntu Linux. In fact, these commands are missing from my installation. How do I install nslookup and related dns client commands?
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