The N/A pagerank (grey pagerank bar) might be due to one of the following reasons:
(1) the web page is new, and it is not indexed by Google yet,
(2) the web page is indexed by Google, but it is not ranked yet,
(3) the web page was indexed by Google long ago, but it is recognised
as a supplemental (Supplemental Results) page,
(4) the web page or the whole website is banned by Google.
Fui ver e banido não está.
O que é isso de ser um Supplemental result ??