What it is
Every IP address belongs to an autonomous system, and ASNs are broadly classifiable: consumer ISPs, mobile carriers, hosting and cloud providers, and so on. A datacenter IP is one allocated to hosting infrastructure — the kind of address you get by renting a VPS, not the kind your ISP gives your house.
Why it matters for Minecraft
Because the base rates are so different. Almost nobody plays Minecraft from a rented VPS, while a great deal of automated traffic runs on exactly that, because it is the cheapest way to get bandwidth and addresses. That asymmetry makes datacenter origin one of the highest-yield signals available: challenging it costs you very few real players and costs an attacker a lot.
Where it stops working
Against residential proxies, which exist specifically to present consumer addresses. Origin scoring is therefore a strong first filter rather than a complete one — it removes the cheap attacks efficiently and leaves the expensive ones for behavioural checks. Mobile carrier ranges should be classified as consumer, not datacenter, or you will lock out players on phone hotspots.
Common questions
Will blocking datacenter IPs block real players?+
A few, and it is worth being deliberate about which. Players on some VPNs, corporate networks or cloud gaming services can appear as datacenter. Challenging rather than blocking keeps them reachable while still raising the cost for bots.
How is a datacenter IP detected?+
By ASN and published allocation data, plus commercial intelligence that tracks which ranges belong to hosting providers. It is far more reliable than geolocation, because ownership is a matter of registry record rather than inference.