CREST Practitioner Security Analyst (CPSA) Practice

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The 'WHOIS' protocol is typically associated with which port?

  1. 43

  2. 80

  3. 23

  4. 443

The correct answer is: 43

The 'WHOIS' protocol is associated with port 43. WHOIS is a query and response protocol used primarily for querying databases that store registered users or assignees of a domain name or an IP address block. When a WHOIS client wishes to find information about a domain or IP address, it sends a query to a WHOIS server over this specific port. Port 80 typically handles HTTP traffic, which is used for web communications; port 23 is used for Telnet, a protocol for text communication over the internet; and port 443 is associated with HTTPS, which is HTTP over TLS/SSL for secure communication. Each of these ports serves different purposes in networking, confirming that port 43 is the correct and dedicated port for WHOIS queries.

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