How to get hostname from IP (Linux)?

Question

I would like to get the remote machine/hostname through IP Address. I found lots of answers such as the nslookup, host, resloveip, etc.. but I still can't get hostname from my target machine(centOS, ubuntu, etc...) Does it seem to need to register to the DNS server?

I have a machine named to test and using IP 10.1.27.97

but I used the method above still can't get "test"

Can anyone help me to get the hostname to form an IP Address?

Answer 1

In order to use the nslookup, host, or gethostbyname() then the target's name will need to be registered with DNS or statically defined in this host's file on a machine running your program. Yes, you could connect to a target with SSH or some other application and query it directly, but for a generic solution, you'll need some sort of the DNS entry for it.

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