Doing a whois on the domain name, shows the registrant is from North Brabant, Netherlands. Their primary cloudflare stuff pings back to Canada, but the secondary and tertiary locations I get are in the US.
Edit 2: The ip online tool on the website below indicates that it may actually be physically hosted in US (on a virtual server as, according to Wikipedia, Hetzner doesn't offer bare metal servers in US).
AfaIk, they are hosted at Hetzner, so physically in Germany or Finland.
If I remember correctly, the main servers are in Hetzner's data centre in Finland with back-ups in Germany. Although they have a complex set-up so it may not be as cleanly divided up these days.
I suspect half the Fediverse runs on Hetzner at this point.
The US IP address is for Cloudflare, who are acting as a front end for things like DDoS protection. A lot of lemmy servers use them, which is unfortunate, but there don't seem to be any viable European alternatives.
You can check the details with the whois command. The relevant bit when querying for one of their addresses is:
NetRange: 104.16.0.0 - 104.31.255.255
CIDR: 104.16.0.0/12
NetName: CLOUDFLARENET
NetHandle: NET-104-16-0-0-1
Parent: NET104 (NET-104-0-0-0-0)
NetType: Direct Allocation
OriginAS: AS13335
Organization: Cloudflare, Inc. (CLOUD14)
RegDate: 2014-03-28
Updated: 2024-09-04
Comment: All Cloudflare abuse reporting can be
done via https://www.cloudflare.com/abuse
Comment: Geofeed: https://api.cloudflare.com/local-ip-ranges.csv
Ref: https://rdap.arin.net/registry/ip/104.16.0.0
They probably use Cloudflare for Loadbalancing and Anti DDOS. This doesn’t mean it is hosted on Cloudflare, it is only a proxy. The point is not to show you the real IP so you can’t attack the origin server.