said by seropith 
:So these are public servers, or servers for customer user?
OpenDNS adds a few ms response time.
We should be able to use the ISP's DNS server. Not some servers that we are not technically supposed to use (4.2.*) or sign up for stuff like opendns.
said by factchecker :
If you can use them, use the following public DNS servers:
4.2.2.1
4.2.2.2
4.2.2.3
4.2.2.4
4.2.2.5
4.2.2.6
Or, if you are inclined to, try OpenDNS.
You don't have to sign up for opendns, just put in 208.67.222.222 and 208.67.220.220 and off you go.
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