Customers often ask us what DNS resolvers we recommend to use. However, it is not easy to answer this question if we consider the performance/uptime. We can now recommend using the following resolvers: Google Public DNS 8.8.8.8 8.8.4.4 2001:4860:4860::8888 2001:4860:4860::8844 NTT 129.250.35.250 129.250.35.251 2001:418:3ff::53 2001:418:3ff::1:53 Verisign Public DNS 64.6.64.6 64.6.65.6 2620:74:1b::1:1 2620:74:1c::2:2 Level 3 4.2.2.2 4.2.2.4