Support for the Ruby 2.4 series has ended. See here for reference.
Returns a String based representation of a valid DNS hostname, IPv4 or IPv6 address.
IPSocket.getaddress 'localhost' #=> "::1" IPSocket.getaddress 'broadcasthost' #=> "255.255.255.255" IPSocket.getaddress 'www.ruby-lang.org' #=> "221.186.184.68" IPSocket.getaddress 'www.ccc.de' #=> "2a00:1328:e102:ccc0::122"
 
               # File ipaddr.rb, line 654
def getaddress(s)
  if valid_v6?(s)
    s
  else
    getaddress_orig(s)
  end
end