Originally Posted by Schind

They only have two or three months' production of the A320 family listed on that site. Airbus will have allocated MSNs probably a year in advance of production but getting hold of that info is the key. Even if the people running the site have the info, for the A320s at least there'd be pages and pages to click through to get to the current aircraft in production so they'd probably choose not to publish it all at once.