Unfortunately, despite the anycasting, advanced caching, and extensive security features, Google Public DNS is not the ideal DNS service. For one thing, it's not called “experimental” for nothing. From my home, I can’t reach 188.8.131.52. Packets end up ping-ponging between the addresses 184.108.40.206 and 220.127.116.11. Apparently some routing engineer at Google is a bit dyslexic.