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I've been in IT since 1997. Back in the old times, network blocks were like free. I've worked for several places with full /8 public CIDRs - One employer didn't even NAT the addresses and every PC and server on our network had a public IP address. Firewalls were in place so the IPs weren't public in the traditional sense, but it was always fun explaining to some new hire why our IP addresses didn't look like they expected.
That's when I started my career, '98 for me. I was installing cable internet and DSL when those were new. Everyone just jacked straight into the internet, straight into the wall, butt naked! I was telling all my customers to download ZoneAlarm. :)
That explains all the semen on the Internet in the 90’s; jacking it butt naked straight into the internet will have that effect.