You are running BGP in your network and want to automate filter generation for your routers ? Well, with BGPQ3 it's as easy as: 
 user@host:~>bgpq3 -Jl eltel AS20597
 policy-options {
 replace:
  prefix-list eltel {
     81.9.0.0/20;
     81.9.32.0/20;
     81.9.96.0/20;
     81.222.128.0/20;
     81.222.192.0/18;
     85.249.8.0/21;
     85.249.224.0/19;
     89.112.0.0/19;
     89.112.4.0/22;
     89.112.32.0/19;
     89.112.64.0/19;
     217.170.64.0/20;
     217.170.80.0/20;
  }
 }

Details and examples can be found in a man page below.

CHANGES