How to know DNS Server Address -MAC-windows-Linux

How to know DNS Server Address -MAC-windows-Linux Before i expline how know DNS server address i write some point about DNS server . Every device in internet network need to join with  DNS server. DNS server is used for converting your domain name of web site  into IP address. you can know your DNS server address. How to know DNS Server Address -MAC-windows-Linux Before i expline how know DNS server address i write some point about DNS server . Every device in internet network need to join with  DNS server. DNS server is used for converting your domain name of web site  into IP address. you can know your DNS server address.