Fping is a small command line tool to send ICMP (Internet Control Message Protocol) echo request to network hosts, similar to ping, but much higher performing when pinging multiple hosts. Fping totally differs from ping in that you can define any number of hosts on the command line or specify a file with the list of IP addresses or hosts to ping.

Gau is used for finding the URLs of the target website. This tool is used to find all URLs from a website/web application. This tool helps to get subdomains of all HTTPS as well as HTTP websites.