HN should put the IP addresses that comments from brand new accounts are posted from right beside the name.

I bet you'd be able to plot some pretty interesting maps from that.

Maybe the first two octets but HN does not block proxies, VPS nodes, servers, etc... The site would have to block such things for new accounts and store the IP used to create the account for that information to be useful assuming residential shady VPN's were not used. I doubt that level of change would occur here given the topic of dark mode comes up often.