[FREE] Subdomain Takeover Scanner
The best and free subdomain scanner. This tool discovers all subdomains of a domain and check them accessible or not. If subdomains are accessible, the tool looks for their missing HTTP security headers and print them. Also, if there is a subdomain which is vulnerable to subdomain takeover, it prints the vulnerable subdomain.You (visitor) can scan up to 120 subdomains and if you register, you can scan up to 300 subdomains per domain for free. Contact @numaN to remove limits and use premium features. Don't test unallowed websites, it is your responsibility.