Query following IPv6 address for google appengine server by using following IPv6 DNS

Google Public DNS

2001:4860:4860::8888

OpenDNS IPv6
2620:0:ccc::2

Hurricane Electric DNS
nameserver 2001:470:0:45::2

 

If original IPv6 hosts not work in your network, try using following list

[google_ipv6]
mode = http
hosts = 2a00:1450:4013:c00::8d|2404:6800:4008:c01::8d|2a00:1450:4013:c00::8b|2a00:1450:4013:c00::2f|2404:6800:4004:802::1003|2404:6800:4004:802::100a|2a00:1450:4013:c00::84|2607:f8b0:4002:c03::8d|2607:f8b0:4002:c04::84|2607:f8b0:4002:c04::52|2404:6800:4008:c01::52
sites = .google.com|.googleusercontent.com|.googleapis.com|.google-analytics.com|.googlecode.com|.google.com.hk|.googlegroups.com
forcehttps = groups.google.com|code.google.com|mail.google.com|docs.google.com|profiles.google.com|developer.android.com
withgae =
withdns =