How we prevented subdomain takeovers and saved $000s

At OVO Energy, we recently released a tool to prevent subdomain takeovers: Domain Protect, available at https://github.com/ovotech/domain-protect.
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I've published a blog post where I go through the basics of domain takeover, talk about how the requirement arose at OVO, and describe the tool’s features, findings, and planned next steps.
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And you’ll see how we saved many thousands of US Dollars in fees to Bug Bounty researchers.