I am not sure that I understand your question. Having a public address is not enough. Even if you did acquire a public address without an ISP you would still need a physical link and some kind of routing logic (might be dynamic routing protocol or might be static routes), and you would need the ISP's backbone to be able to get traffic to the Internet.
Your question sounds like you are asking how to connect to the Internet without an ISP. Perhaps you can clarify your question and if so perhaps we can find an answer.
Ips from IANA is fine but the world has to know where your IPS are present so you will have to peer with someone and advertise your IPs to the internet. So yes the ISPs near ur place are indispensable, what matters is the way you peer with them.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...