DNS/hijacking/SubdomainTakeover/hostileについて、ここに記述してください。
Types of services you create subdomains to use are:
a shopping cart for your ecommerce website,
a ticketing system like ServiceNow,
a CDN
Various cloud platforms
Externally hosted subdomain based websites
and so onA hostile subdomain takeover means that an attacker registers with the service you used but no longer use and register to use your abandoned subdomain.