A public IP address is aninternet-routable address assigned by an Internet Service Provider (ISP), making option B the correct answer. Public IPs uniquely identify a device or network on the global internet and allow communication with external systems.
Option A is incorrect because public IPs are unique, not shared by everyone. Option C is incorrect because IP addresses assigned by a modem or router to internal devices are private IP addresses, typically managed using Network Address Translation (NAT).
From an ethical hacking perspective, public IP addresses are significant because they representexternally exposed attack surfaces. Services accessible via public IPs may be scanned, targeted, or attacked if not properly secured.
Understanding the difference between public and private IP addressing helps ethical hackers assess network exposure, firewall configurations, and access control policies. Defenders can reduce risk by limiting services exposed on public IPs and enforcing strong security controls.
Public IP management is a core information security concept, influencing perimeter security, network design, and threat modeling in modern environments.
