Public DNS Servers

Public DNS servers: Name servers specifically set up so that anyone can use them for free

•  ​Using these public DNS servers is a handy technique for ​troubleshooting any kind of ​name resolution problems you might be experiencing

​An ISP almost always gives you access to ​a recursive name server as ​part of the service it provides.

Most public DNS servers are ​available globally through anycast.

Always make sure the name server is ​run by a reputable company and try ​to use the name servers provided by ​your ISP outside of troubleshooting scenarios.

Most public DNS servers ​also respond to ICMP echo requests, ​so they’re a great choice for testing ​general Internet connectivity using ping.