It ends by obtaining the sub-domain name if it meets any Wildcard DNS, which is a non-existing domain. Therefore, it uses the –wildcard option to allow parameters to continue the attack even if there is any Wildcard Domain.
gobuster dir -u geeksforgeeks.org -w /usr/share/wordlists/dirb/common.txt –wildcard
gobuster dir -u geeksforgeeks.org -w /usr/share/wordlists/dirb/common.txt –wildcard