assignment policy is documented in:
        
        RIPE NCC members can request AS Numbers using the
form available in the LIR Portal or at:
        
****************************************************
        Information about the RIPE Database can be found at:
        http://www.ripe.net/db/index.html
****************************************************
-------------------------------------------------------------
Communities definitions
-------------------------------------------------------------
6663:2000 Not Announced to peers
6663:200N Prepend N*6663 for announcing to peers, N=[1,5]
6663:3000 Not Announced to upstream providers
6663:300N Prepend N*6663 for announcing to upstreams, N=[1,5]
6663:10000 Prefix filtering
-------------------------------------------------------------


The above information was collected from whois.ripe.net, using
object "AS6663" on July 15, 2010