There are many tools available to interact with DNS, but today I’m going to cover the use of nslookup, host, and dig on the command line, and the netcraft website. My local DNS server is 192.168.103.250 My local DNS server was queried on port 53 (192.168.103.250#53) The answer is non-authoritative, though it is the best answer my local DNS server has, and My domain has the IP address 192.185.16.82 Moving on, let’s see if we can determine what mail servers are used to handle mail to this domain. This can be performed by querying another DNS server - in the following example, I query Google’s public DNS server by appending its IP at the end of my command: