From: Bill Kelly <billk@...>
Date: 2009-05-14T19:20:19+09:00
Subject: Re: the question about getaddinfo


From: "Qq Zz" <zq1956@sina.com.cn>
>
> I use getaddinfo to get A machine's hostname,
> in B machine,the result is correct.
> but in A machine,the result is just A machine's name
> I use nslookup,the result is also correct.
> who can tell me why in A machine，the result is wrong?

I ran into something similar awhile back:
http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-core/13805

This is what I now use:

  ip = "208.77.188.166"
  result = Socket.getnameinfo( Socket.pack_sockaddr_in(0, ip) )
  hostname = result ? result.first : ip


Hope this helps,

Bill