Gobuster is a Directory/File, DNS and VHost busting tool written in Go. The following command performs bruteforcing on subdomains.
Command Reference:
Mode: DNS
Nameserver IP: 10.10.10.1
Domain: test.local
Subdomain wordlist: /usr/share/wordlists/seclists/Discovery/DNS/fierce-hostlist.txt
Pattern file: patterns.txt
Output file: output.txt
gobuster dns -q -r 10.10.10.1 -d test.local -w /usr/share/wordlists/seclists/Discovery/DNS/fierce-hostlist.txt -p ./patterns.txt -o output.txt