Zie https://labs.spotify.com/2015/11/05/oh-ipv6-where-art-thou/ Enkele quotes: "IPv6 support was enabled in the Spotify Android client in version 2.9.0. Today about 4% of all backend connections made from an Android device originate in an IPv6 network. So what about our other clients? Up until now there has been no compelling reason to enable IPv6 support other than for the good of mankind. However, Apple is now talking about making IPv6 compatibility a requirement for apps in the App Store. Therefore the iOS client has just enabled IPv6 support, which is gradually rolling out starting in version 4.3.0. ï¿ŒOur partner Facebook is also pushing IPv6 and they are implementing an IPv6-only network in their offices. The desktop client does not work in an IPv6-only network so the Facebook engineers are sad because they can no longer rock. Sad Facebook is lifting the IPv6 priority for the desktop client as well."