To find out the IP address or addresses of the Domain Name System (DNS) servers that your Linux or Unix system is using, you can use the dig command or the nslookup command.
The dig command is a powerful tool for querying DNS servers and performing DNS lookups. To find out the IP address of the DNS server that your system is using, you can use the following dig command:
dig +short @resolver1.opendns.com myip.opendns.com A
This command will perform a DNS lookup for the myip.opendns.com domain using the OpenDNS resolver at resolver1.opendns.com, and return the IP address of the DNS server in a short, easy-to-read format.
The nslookup command is another tool for querying DNS servers and performing DNS lookups. To find out the IP address of the DNS server that your system is using, you can use the following nslookup command:
nslookup -type=A myip.opendns.com resolver1.opendns.com
This command will perform a DNS lookup for the myip.opendns.com domain using the OpenDNS resolver at resolver1.opendns.com, and return the IP address of the DNS server.
Keep in mind that these commands may not work if your system is configured to use a local DNS cache or a private DNS server. In such cases, you may need to consult your system's configuration files or seek assistance from a qualified administrator to determine the DNS server IP addresses.
For more information about using the dig and nslookup commands to perform DNS lookups, you can consult their respective documentation or seek assistance from a qualified Linux or Unix administrator.