The NSLookup Utility

The NSLookup utility is used to view information such as resource records held by Domain Name System (DNS) servers. It can be run from a single command line using switches or interactively from a NSLookup command prompt.

NSLookup ? or help returns a list of NSLookup commands

NSLookup server specifies which server to query

NSLookup ls lists the names in a domain

NSLookup ls a lists the Canonical names (CNAME) and their aliases in a domain

NSLookup ls d lists all the resource records

NSLookup set all displays the current value of all settings

You can use NSLookup to view the contents of any DNS server for which the Internet Protocol (IP) address or domain name is known. Subject to firewalls of course.