Google also offers IPv6 public DNS servers, maybe that helps? (probably not though as they might not yet have turned on ipv6) 2001:4860:4860::8888 and 2001:486

Google also offers IPv6 public DNS servers, maybe that helps? (probably not though as they might not yet have turned on ipv6) 2001:4860:4860::8888 and 2001:4860:4860::8844 Also look at the other links that user lemonade posted here.