How Datacenter Proxies Actually Work

When an IP is assigned to a commercial hosting entity — a cloud provider, a colocation facility — the ASN it belongs to is registered in public internet registries as commercial infrastructure.

Every major IP intelligence database maintains these records. Targets that use IP reputation as a detection signal can resolve any inbound request to its ASN within milliseconds. Datacenter IPs resolve to commercial blocks. This is not a configuration flaw. It is the permanent structural property of the IP.

An Autonomous System Number is a routing identifier assigned to a network operator. All IPs in that network share the same ASN. When a cloud provider holds an ASN, every IP in that block inherits the commercial classification.

Targets that block by ASN block the entire registered range of a commercial operator — not individual addresses, not by request volume. The block fires the moment the origin IP resolves to a commercial block.

Subnet reputation works at finer granularity. Within a commercial ASN, individual subnets accumulate block history from observed traffic. A /24 that's been used for scraping or abuse develops a score independent of other subnets in the same ASN. This is where provider differentiation is real — active subnet rotation and IP stock management, not inherent IP quality.

Datacenter proxies are provisioned on servers the provider owns or leases. IPs are obtained through ARIN, RIPE, or APNIC allocations, or through secondary market purchase. The provider's infrastructure terminates client connections and forwards them through outbound IPs in their pool.

Shared datacenter IPs are used simultaneously by multiple customers — reputation accumulates from all of them. Dedicated IPs are assigned to one customer — all degradation is yours alone. Dedicated pricing is only worth it when shared pool contamination becomes the binding constraint. Most scraping operations at moderate scale don't reach that threshold.

Throughput is the real advantage. Bandwidth is provisioned on commercial infrastructure with gigabit-level capacity per server. Per-GB pricing is low because the infrastructure cost is low relative to the bandwidth it supports. For high-volume workloads on targets that don't filter by ASN, datacenter delivers the lowest cost-per-request of any proxy type.

Most operators discover this through failed requests, not through research. By then they've already paid for a month of datacenter proxies on a target that categorically blocks them.

Targets that block by ASN block datacenter IPs categorically. Not by individual reputation. Not by request volume. Not by behavior. The block fires the moment the request's origin resolves to a commercial ASN.

Switching datacenter providers doesn't help here. The replacement IPs share the same classification. The only exit from ASN-based blocking is exiting the datacenter IP type entirely. This is where most operators discover the problem — through failed requests, not through research.

Most hardened targets — e-commerce platforms, social networks, search engines at volume — implement ASN filtering at minimum. Datacenter proxies are a known, enumerated target for these sites. Not slow. Already classified.

Moving to residential proxies removes the ASN block vector. What it costs: per-GB pricing is typically 5–15x higher, and session stability is lower because exit nodes are consumer devices, not managed infrastructure. For targets that don't filter by ASN — many B2B data sources, public APIs, unprotected endpoints — the cost increase buys nothing.

ISP proxies sit in a narrow middle: residential IP classification on commercial infrastructure. The ASN resolves as residential because the provider holds ISP-sourced IP allocations. Session stability matches datacenter. The trade-off is pool size — ISP pools are significantly smaller than residential peer networks — and per-GB pricing higher than pure datacenter.

Datacenter proxies are not an inferior product. They are the right product when the target's detection layer doesn't include ASN filtering — and the wrong one when it does.