This page lists the external Overlay Networks DN42 is connected to

Network v4 v6 TLDs Remarks
NeoNetwork X X .neo  
ICVPN X X see ICVPN-Meta ICVPN ("Inter City Vpn") is where many Freifunk communities interconnect with each other. Altough it should not be done, some peers block the range which is used for ICVPN.
ChaosVPN X   .hack Few active hosts
CRXN   X .crxn In progress