Subdomain takeover is a critical cybersecurity threat that occurs when attackers exploit forgotten or misconfigured DNS records to seize control of a subdomain, potentially leading to data breaches, phishing attacks, and brand damage. This vulnerability arises when subdomains point to unused third-party services, allowing adversaries to create accounts and deploy malicious content. Despite being a well-known issue since ethical hacker Frans Rosén and Detectify popularized it in 2014, it remains prevalent and often overlooked, affecting even major companies like Microsoft, Sony, and Uber. Thomas Chauchefoin, a security analyst, emphasizes the importance of maintaining good DNS hygiene and monitoring external attack surfaces to prevent such attacks. Tools like Detectify help organizations identify and mitigate these risks by leveraging a network of ethical hackers to continuously scan and alert on vulnerable subdomains, ensuring that companies can address potential takeovers before they occur.