The Border Gateway Protocol (BGP) is used to route traffic across the Internet — and it’s a pretty old, creaky protocol that’s open to abuse. Back in August 2014, an Italian web hosting company faked ownership of 256 IP addresses, under the direction of a special arm of Italy’s Military Police and Hacking Team. The police were trying to use the latter’s remote control system malware to monitor targets of interest, but certain IP addresses were unreachable as their true owners, Santrex, kept them locked down for criminal use. Then, when Santrex apparently went out of business, the police remained locked out of these addresses.
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https://www.engadget.com/2015/07/13/hacking-team-helped-italian-police-to-hijack-internet-addresses/