Which tool is recommended for passive footprinting of a target web presence?

Which tool is recommended for passive footprinting of a target web presence?

• A. Dig
• B. Netcraft
• C. Ping sweep
• D. Nmap

Answer: (B)

Passive footprinting aims to build a profile of the target without interacting with its systems. Netcraft fits this approach because it gathers information about a website from publicly available sources, historical records, and observable web data, such as hosting details, IP address history, server technologies, TLS/SSL information, and domain metadata. You can learn who hosts the site, what technologies it uses, and related domain relationships without sending probes to the target’s servers, making it ideal for passive analysis. In contrast, the other options involve active probing or direct interaction. A DNS query tool like Dig requires contacting DNS servers to resolve records, which can reveal interest and can be considered an active step. A ping sweep sends ICMP packets to a range of addresses to discover live hosts, which is clearly active scanning. Nmap is a dedicated port-scanning tool that probes services running on hosts, also an active method.

Passive footprinting aims to build a profile of the target without interacting with its systems. Netcraft fits this approach because it gathers information about a website from publicly available sources, historical records, and observable web data, such as hosting details, IP address history, server technologies, TLS/SSL information, and domain metadata. You can learn who hosts the site, what technologies it uses, and related domain relationships without sending probes to the target’s servers, making it ideal for passive analysis.

In contrast, the other options involve active probing or direct interaction. A DNS query tool like Dig requires contacting DNS servers to resolve records, which can reveal interest and can be considered an active step. A ping sweep sends ICMP packets to a range of addresses to discover live hosts, which is clearly active scanning. Nmap is a dedicated port-scanning tool that probes services running on hosts, also an active method.