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You’re talking about Border Gateway Protocol, BGP, route hijacking and it’s occasionally been a real headache over the years. Advertising routes used to be a more manual process so typos and incorrect entries, like what you’re talking about, we’re reasonably common. It was, and still can be, done maliciously too.
https://www.techtarget.com/searchsecurity/tip/How-does-BGP-hijacking-work-and-what-are-the-risks
Yup! BGP is an absolute mess and it is kind of a disgrace that it’s still the lynchpin of the internet
