A tool which might be used by an attacker during the reconnaissance phase of an attack to glean information about domain registrations is: Whois.
<h3>What is a DNS server?</h3>
A DNS server can be defined as a type of server that is designed and developed to translate domain names into IP addresses, so as to allow end users access websites and other internet resources through a web browser.
This ultimately implies that, a DNS server refers to a type of server that translate requests for domain names into IP addresses.
In this context, we can infer and logically deduce that Whois is a tool which might be used by an attacker during the reconnaissance phase of an attack to glean information about domain registrations.
Read more on a domain names here: brainly.com/question/19268299
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