For example I do in Linux using host command:

host yy.yyy.yy.y


Host z.zzz.zz.z.in-addr.arpa. not found: 3(NXDOMAIN)

Then I repeat host command in a reverse with z.zzz.zz.z than I got a result of pastyy.yyy.yy.y:

Host z.zzz.zz.z


Host yy.yyy.yy.y.in-addr.arpa. not found: 3(NXDOMAIN)

What is occured and why is that result?

When I try got a WHOIS address of z.zzz.zz.z and yy.yyy.yy.y I got for example:

  yy.yyy.yy.y --> KOREA NIC
  z.zzz.zz.z --> JAPAN NIC

A result via WHOIS is on properly address, but when I use host command it result same.

For others who not understand my question look at this:

xx@yy:$ host
Host not found: 3(NXDOMAIN)
xx@yy:$ host
Host not found: 3(NXDOMAIN)  <--- Why ? WHOIS don't respond this IP
  • 2
    Your question is utterly unclear. Use the real IP addresses in your question. – Dennis Kaarsemaker Aug 11 '13 at 17:18
  • 1
    Are you on IP a.b.c.d and are you trying d.c.b.a.in-addr.arpa? (Note the reversed sequence in abcd and dcba) – Hennes Aug 11 '13 at 18:01
  • I believe the OP has no idea at all what he/she's doing. – Marki Aug 11 '13 at 21:40

I also don't understand your question fully, but:

If you want to perform a reverse lookup e.g. of using the host command you simply type


That's it. You don't need to use anything in-addr.arpa or invert the bytes when using the host command in order to perform a reverse lookup.

| improve this answer | |
  • Look at question. I've edited. – Marin Sagovac Aug 11 '13 at 20:24
  • Read my answer again. I believe it perfectly explains what you want to know. Maybe you should also read some docs: en.wikipedia.org/wiki/… – Marki Aug 11 '13 at 21:00
  • Sorry, it's reversed. I have bad day sorry! I know know. Solved. – Marin Sagovac Aug 11 '13 at 22:56

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