Bgpq4 eases BGP filter maintenance by automatically generating prefix lists, (extended) access lists, policy statement terms and AS-path lists using IRR routing data. It features IPv6 prefix-/access-list support, aggregation of generated filters and output compatible with Cisco, Juniper, Mikrotik, Nokia, OpenBGPD and BIRD.

It is a fork of bgpq3. By default, it uses IRR server from NTT.