IPv6 Query is one of the very first iPhone applications that can resolve IPv6 Addresses. Because the high level iPhone SDK classes provided by Apple do not support IP version 6, they can not resolve host names. IPv6 Quert uses C to resolve DNS instead of the Cocoa
classes that refuse to return IPv6 addresses.

The app created by infinitycg will let you test host names for IPv6 support and also provides reference material.

The app costs $0.99 in Itunes and can be found under the Utilities categorie