https://arstechnica.com/information-technology/2021/04/pentagon-explains-odd-transfer-of-175-million-ip-addresses-to-obscure-company/

The US Department of Defense puzzled Internet experts by apparently transferring control of tens of millions of dormant IP addresses to an obscure Florida company just before President Donald Trump left the White House, but the Pentagon has finally offered a partial explanation for why it happened. The Defense Department says it still owns the addresses but that it is using a third-party company in a "pilot" project to conduct security research.

"Minutes before Trump left office, millions of the Pentagon's dormant IP addresses sprang to life," was the title of a Washington Post article on Saturday. Literally three minutes before Joe Biden became president, a company called Global Resource Systems LLC "discreetly announced to the world's computer networks a startling development: It now was managing a huge unused swath of the Internet that, for several decades, had been owned by the US military."