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nslookup command

Linux / Unix: Look Up IP Addresses

How can I look up IP addresses under UNIX or Linux operating systems using command line options?
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Reverse nslookup Command

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?
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Q. How do I change existing name server IP address? How do I configure DNS name server IP address under Ubuntu Linux / Debian Linux? How do I configure DNS name resolution under Ubuntu Linux?
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HowTo Test or Check Reverse DNS on a Linux / Unix

I am a new Linux and Unix command line user. How do I test or check reverse DNS for given IP address under Linux, OS X, BSD, Unix-like or Windows XP/Server 2003 based systems?
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