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![](https://lemmy.dbzer0.com/pictrs/image/a18b0c69-23c9-4b2a-b8e0-3aca0172390d.png)
No, you misunderstand. You’re thinking of DHCP. The parent poster is talking about CGNAT, where hundreds or thousands of customers of an ISP may share the same public-facing IPv4 address. It’s impossible to self-host anything in this scenario, there no way around it and DDNS won’t help you.
Blaming remote work, the avacado toast of 2023.