getting hostname with IP

how to get hostname with IP without logging into the host

From stackoverflow

• • For Win32, getnameinfo().
  • For POSIX, gethostbyaddr().

  Making a portable wrapper is left as an exercise. :)

  Matthew Flaschen : In Java, there's InetAddress.getHostName(). Does that count? :)

• i am not using it in code. just tell the method . the host is a unix host

• If you're not using it in code (and you're not, according to an answer you posted, which should have really been an edit to your question :-), it's not a programming question.

  But the answer is to use nslookup.

  Microsoft Windows XP [Version 5.1.2600]
  (C) Copyright 1985-2001 Microsoft Corp.
  
  C:\Documents and Settings\Administrator>nslookup www.company.com
  Server:  bhadns01.company.com
  Address:  9.190.234.35
  
  Non-authoritative answer:
  Name:    www-int.company.com.cs186.net
  Address:  129.42.58.216
  Aliases:  www.company.com
  
  C:\Documents and Settings\Administrator>nslookup 129.42.58.216
  Server:  bhadns01.company.com
  Address:  9.190.234.35
  
  Non-authoritative answer:
  Name:    www-int.company.com.cs186.net
  Address:  129.42.58.216
  Aliases:  www.company.com
  
  C:\Documents and Settings\Administrator>
  

  Zaagmans : or do it the other way around: nslookup 9.190.234.35

  paxdiablo : Thanks, @Z, I had to edit that bit in since I initially misunderstood the question.

• nslookup

  It's on both Windows and Linux.