Where are your datacenters

Two regions: the United States and Europe. You choose the region when you order, the pools are separate rather than one pool serving both, and you can hold addresses in both regions on a single billing account. The American pool is the larger of the two.

Why the region is a real decision

It is easy to treat this as a latency question and stop there. Latency matters least of the three things actually at stake.

• Coherence. A European business whose entire estate answers from American addresses is describing something about itself. Where the audience is regional, addresses that match the region are simply a more believable arrangement.
• Jurisdiction. Where the data physically sits determines which legal regime applies to it. For customers with obligations about keeping data inside a particular area, this is the whole question and nothing else about the product matters until it is answered.
• Latency. Real but usually the smallest factor for a content site, where caching does more for perceived speed than the physical distance does.

Mixing regions on purpose

Holding both is normal and is a form of diversity in its own right. An estate whose addresses vary by continent as well as by block is harder to describe as one network than an estate that varies only by block.

The practical arrangement is usually driven by audience: sites aimed at a European market on European addresses, sites aimed at an American market on American ones. That gives you the separation as a by-product of a decision you would have made anyway, which is the best kind.

What the two pools have in common

Both are built the same way. Non-consecutive Class C blocks, private nameservers available per domain, the same control panel, the same automated provisioning. The European pool offers a choice of country within it, which the American pool does not need in the same way. The higher address tiers exist in both regions, with the European allocation smaller at every tier, which is a supply fact rather than a policy.

Choosing between them

Work in this order. If you have a data residency requirement, that decides it and nothing else is relevant. If your audience is clearly regional, follow the audience. If neither applies, the American pool is larger and gives you more room to grow within one region, while a mixed holding buys you a second axis of separation.

Country-level selection within Europe is covered in IP Diversity. The regional product pages are SEO hosting in the USA and SEO hosting in Europe, and the same regional split applies to VPS and dedicated servers.