It appears to be an Aranda (Arachnis x Vanda) or Mokara (Arachnis x Ascocentrum x Vanda) hybrid. Unless you have a very extensive Vandaceous collection that probably narrows down your database search quite a bit.
With the fairly recent reclassification of Ascocentrum as Vanda, any Mokara would be Aranda now. But unless it is a very recent purchase your database would most likely still list Mokara.