You'd have to try the service and test the IP addresses to be sure, but yeah maybe it's running on Fly. Or any other cloud network(s) with servers in those loca

You'd have to try the service and test the IP addresses to be sure, but yeah maybe it's running on Fly. Or any other cloud network(s) with servers in those locations, which could be any (or multiple) of them - it's a fairly common set of regions. The reason most cloud providers have overlapping datacenter locations is generally explainable by the fact that they all rent space in the same physical buildings (e.g. an Equinix datacenter), where they peer with each other and classify the building as an "internet exchange point" (IXP). These buildings tend to congregate near each other for historical or geographical reasons, like proximity to the landing terminal of an undersea cable, or inheriting a building from the old DARPA network. It's actually quite annoying how clouds will label their region e.g. "gcp-eu-1," but it's actually just a reference to some rack space that Google rents in the same London Equinix datacenter as AWS and Azure.