Has PSI been assigned network 1?

Vadim, I thought that ANS was still using CNSSes and ENSSes, which I don't
   believe that Cisco built. Please let me know if I have misunderstood your
   statement here.

I believe that the relevant point here is that NSSes are not
commercially available to the general public. They certainly seem to
require care and feeding above and beyond the level that most ISPs
seem interested in providing. How many Curtis' can we clone?

As to whether or not ANS is still a "large service provider" depends
on your definition and on the future.