Route Views

Hello,
  Some prefixes in the Route Views routing table do not have a prefix
length specified. For example,
  4.0.0.0 and 61.0.0.0 do not have a prefix length specified in the Route
Views routing table. 61/8 belongs to APNIC. 4/8 belongs to Genuity.

Its means its an old style natural classless network. And yeah it
should be fixed in my view.