alt Hacker News173.245.58.0 is owned by cloudflare (https://www.cloudflare.com/ips/). You're probably tracking the IP address of cloudflare's reverse proxy that hits your application instead of true source IP (which cloudflare will copy into X-Forwarded-For header).
Likely you pulled this IP from your application's logs? If you're trying to track bot traffic, use Cloudflare's built-in analytics tool.
Also a single source IP can be hosted in geographically distinct locations - that's called anycasting, which cloudflare does use, however I don't think that's the issue here.
It’s possible, but I think it’s typically used for ingress (ie same IP, but multiple destinations, follow BGP to closest one).
I don’t think I’ve seen a similar case for anycast egress. Naively, doesn’t seem like it would work well because a lot of the internet (eg non-anycast geographic load balancing) relies on unique sources, and Cloudflare definitely break out their other anycast addresses (eg they don’t send outbound DNS requests from 1.1.1.1).