Funny thing, time.is uses Cloudflare, and I only found out because of the outage.

Fun fact: there actually is an IP version 5, and the reason we went from v4 to v6.

The browser extension also lets you scan the page for QR codes for the TOTP key.

And I feel like it’s not a good idea to have a modem directly attached to the pc directly unless you’re using it as a router?

Yeah I feel like this is the issue. The modem/router would be firewalling between the networks hiding the PC behind it.

Also from the description, does OP have a router at all? Is their ISP somehow just allocating public IPs to everything? Do your IPs start with 192.168 or something else?