function lookup (name)
  local resolv = fs.open('/etc/resolv.conf','r')
  local ns=tonumber(resolv.readLine())
  local message=textutils.serialize({"CNT",name})
  rednet.send(ns,message)
  
  local senderId, reply, distance = rednet.receive()
  local count = 0
  while senderId ~= ns do
  	local senderId, reply, distance = rednet.receive()
  end

  local address=textutils.unserialize(reply)
  return address[2]
end