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For user is important DNS resolvers, which can be use to resolve DN to ip. You can use DNS from your provider, or free DNS like
GOOGLE DNS SERVERS
Google operates the world’s largest public DNS service. Launched in December 2009, it supports many billions of DNS queries per day
8.8.8.8 8.8.4.4
OPENDNS SERVER
Supports billions of DNS queries per day via its servers.
208.67.222.222 208.67.220.220
Norton DNS
Security software company Symantec began offering its free Norton DNS in 2010.
198.153.192.50 198.153.194.50
Comodo Secure DNS
In addition to its free DNS service, Comodo is known for the Antivirus package it sells along with other software products.
8.26.56.26 8.20.247.20
NeuStar DNS
156.154.70.1 156.154.71.1
Slovanet DNS
195.80.171.4 195.28.64.119
Nextra DNS
195.168.1.4 195.168.1.2
Dial Telecom DNS
217.67.16.4 217.67.16.3
Slovak Telecom DNS
195.146.128.60 195.146.132.59
Orange DNS
213.151.200.3 213.151.208.167