Describe how an attacker can use whois databases and the nslookup tool to perform reconnaissance on an institution before launching an attack. Discuss why whois databases should be publicly available.]

The answer to this question as follows:

Explanation:

Whois database system and the nslookup software tool:

In each organization, the IP addresses can be identified by a hacker, that uses the whois database system and the nslookup software tool to attack certain IP addresses during most of the attack.

Whois databases system:

The Whois database systems must be made public because they're the key guide when finding a domain respondent or IP address chain.