The　vast　address　space　of　IPv6　makes　it　impractical　to　apply　exhaustive　scanning　to　survey　the　entire　network.　Existing　studies　that　aim　to　quickly　discover　active　IPv6　addresses　by　optimizing　the　scanning　space　face　issues　of　poor　scalability　and　high　time　complexity,　which　hinder　a　comprehensive　under-standing　of　the　IPv6　network　and　impede　the　timely　provision　of　security　snapshots.　Fortunately,　the　emergence　of　programmable　switches　provides　an　opportunity　to　address　the　above　issues.　To　this　end,　we　propose　6Map,　a　fast　active　IPv6　address　discovery　system　based　on　programmable　switches.　We　design　a　lightweight　target　generation　algorithm　running　on　the　control　plane　of　the　programmable　switch　and　implement　fast　scanning　address　generation　on　the　switch　ASIC.　The　experimental　results　show　that　the　efficiency　of　IPv6　active　address　discovery　increases　by　40.1　×　compared　to　the　state-of-the-art　method　with　a　100M　probe　budget.　©　2025　IEEE.