ISP vs Datacenter Proxies: Differences, Detection, Price and Which to Choose

Proxy guide · Last reviewed 1 October 2026 · 11 min read

ISP vs datacenter proxies comes down to one question: who is the IP address registered to? Both kinds of proxy usually run on servers in data centres, so both are fast. An ISP proxy’s address belongs to a consumer internet provider, so a website looking it up sees a home broadband network. A datacenter proxy’s address belongs to a hosting company, so the same lookup says “server”. This guide explains what each one is, how websites tell them apart, how they compare on detection, speed, price, rotation and targeting, and when to choose each. If you already know you need a fixed ISP address, see ProxyEmpire’s static residential (ISP) proxies.

What ISP proxies are

An ISP proxy is a proxy whose outgoing IP address comes from a range registered to, and announced on the internet by, a consumer internet service provider: the kind of company that sells home broadband. The proxy server itself usually sits in a data centre, on the same sort of hardware and network links as any other server. What makes it an ISP proxy is not where the machine is, but whose network the address belongs to.

That combination is the point of the product. A website that checks the visitor’s IP sees an address in a broadband provider’s network, the same kind of network ordinary home users connect from. The connection, meanwhile, has the stability of a server: it doesn’t depend on someone’s home router staying switched on.

ISP proxies are almost always sold as fixed addresses. You get one IP per proxy, it stays assigned to you for the subscription, and every request you send through it leaves from that one address. That is why the same product is often called a static residential proxy: the two names describe the same thing. At ProxyEmpire, “ISP proxies” and “static residential proxies” are one product. For the full background, read our guide to what static residential proxies are.

What datacenter proxies are

A datacenter proxy uses an IP address that belongs to a hosting provider, a cloud platform or a server company. Those organisations run their own networks, identified on the internet by their own autonomous system numbers (ASNs), and their address blocks are registered to them, not to a broadband provider. Nobody pretends these are home connections: they are server addresses, and IP databases label them that way.

Datacenter proxies come in two commercial shapes. Some providers rent dedicated datacenter IPs, one fixed address per proxy, billed per IP. Others, including ProxyEmpire, sell rotating datacenter proxies: you connect to one gateway, and your traffic leaves from a pool of datacenter IPs in the country you choose, either with a new IP on every request or with a sticky session that holds one IP for a longer task. That kind is billed per gigabyte of traffic.

Because hosting companies have plenty of addresses and bandwidth, datacenter IPs are the cheapest proxy traffic there is. The trade-off is reputation. Many websites accept them without question, but sites that care about who their visitors are, such as those that fight automated sign-ups or limit access by network type, can treat a hosting address with suspicion, or refuse it outright.

How websites tell ISP and datacenter IPs apart

Every IP address on the internet is part of a block that someone holds. The regional internet registries hand out those blocks and keep public records of who holds them; RFC 7020 describes this registry system and its requirement to provide accurate registration information. Each block is then announced to the rest of the internet by an autonomous system, which RFC 1930 defines as a connected group of IP prefixes run by one or more network operators with a single, clearly defined routing policy. So for any address, anyone can find out which network announces it and which organisation that network belongs to.

IP-intelligence companies go one step further and classify those organisations. Websites, fraud tools and bot-management products buy that data and look up each visitor’s IP when a request arrives. The lookup is quick, can run on every request, and needs nothing from the visitor’s browser.

request from 198.51.100.23  (ISP proxy)
      |
      v
website looks up the IP
      |-- announced by AS64500 "Example Broadband"
      |-- network type: ISP / residential
      v
treated like a home broadband visitor

request from 203.0.113.80  (datacenter proxy)
      |
      v
website looks up the IP
      |-- announced by AS64501 "Example Hosting"
      |-- network type: hosting / data center
      v
treated like a server: may be challenged, limited or blocked

Here is how three widely used IP-intelligence services describe the categories in their own documentation:

That table is the whole reason ISP proxies exist. A datacenter IP fails the network-type check by design, while an ISP proxy’s network passes it. Two honest caveats apply, though.

• Databases also flag proxies directly. The network label is not the only field. MaxMind’s documentation lists an is_residential_proxy trait for addresses on a suspected anonymising network that belong to a residential ISP, and IP2Location’s is_proxy field covers proxies, VPNs, Tor exits and data centres. An ISP address that behaves like a proxy can be flagged even though its network is residential.
• The IP is only one signal. Many sites also look at request rate, cookies, browser fingerprints and account history. A clean ISP address doesn’t fix a script that sends a thousand requests a minute, and a datacenter address with modest, well-behaved traffic is often served without a problem.

ISP vs datacenter proxies: side-by-side comparison

The two products are closer than most proxy comparisons suggest. They run on similar hardware and both are sold with country-level targeting. The real differences are three: who the IP is registered to, whether the address is fixed or rotating, and whether you pay for addresses or for gigabytes. If you are weighing ISP proxies against rotating residential ones instead, read our ISP vs residential comparison.

Speed and reliability

Because both kinds of proxy usually live in data centres, neither depends on a home connection. That separates them from rotating residential proxies, where traffic passes through real household devices whose speed and uptime vary. On an ISP or datacenter proxy, the hop from the proxy to the website runs over a data centre’s network links.

In the ISP vs datacenter proxies comparison, speed is the smallest gap. Datacenter proxies are usually the fastest of all proxy types, because hosting networks are built to move large amounts of traffic. ISP proxies are also fast, but the exact figure depends on where the provider hosts them and how their ISP ranges are routed, so we won’t quote a number: speed is workload-dependent, and the only honest test is your own. Run the same requests through both types, to the same site, from the same place, and compare.

Reliability follows the same logic. A fixed ISP proxy stays on one address for the subscription, so there is nothing to rotate or drop mid-session. A rotating datacenter proxy keeps working even when an individual IP gets rate-limited, because the next request can use a different address.

Price per IP vs price per GB

ISP proxies are priced per address: you pay the same monthly amount for an IP whether you send a megabyte or many gigabytes through it (up to whatever traffic limit the plan sets). Rotating datacenter proxies are priced per gigabyte: you pay for traffic, and the number of IPs your requests are spread across is not part of the bill. Comparing them head to head only makes sense against a real job. Using ProxyEmpire’s list prices on 1 October 2026:

The third row is the one that surprises people. On paper, a handful of ISP IPs carry a lot of traffic for very little money. In practice, a collection job run through five fixed addresses hits per-IP rate limits quickly, because the target sees the same five visitors asking for thousands of pages. A rotating datacenter pool spreads the same traffic across many addresses. So the cheaper model is the one that matches the job: per-IP for identities, per-GB for volume.

When to choose ISP proxies

• Account management. Social media, marketplace and advertising accounts expect their owner to sign in from a familiar place. One fixed ISP address per account keeps each account on the same broadband network, week after week.
• E-commerce and seller tools. Store dashboards, seller portals and inventory tools behave best when the admin login doesn’t move between networks or countries.
• Allow-listed access. Partner portals, staging environments and internal tools that only accept known IPs need an address that doesn’t change. Add it to the list once.
• Sites that refuse hosting IPs. If a site blocks or challenges datacenter ranges for the pages you need, and you need a stable session rather than many addresses, an ISP IP gets you past the network-type check.
• Long sessions from one market. Monitoring dashboards, QA runs and local ad or SEO checks that should look the same every day from one country.

ISP proxies are the wrong choice when you need many addresses, city-level targeting or a country outside the provider’s list. For that, rotating residential proxies are built for the job. To compare ISP providers more broadly, see our roundup of the best ISP proxies.

When to choose datacenter proxies

• Bulk collection from open sites. Public catalogues, documentation, open data and many news and listing sites serve datacenter traffic without complaint. Here, paying residential prices buys nothing.
• SEO and price monitoring. Rank checks, price comparison and market research across thousands of pages, where a new IP per request keeps any single address from carrying too much traffic.
• QA and testing. Load-testing your own site, checking a deployment from another country, or testing how a page behaves from a server network.
• Short jobs that need a stable IP for minutes, not months. A sticky session on a rotating datacenter proxy holds one IP for a multi-step task, such as paging through search results.
• First pass on a new target. Datacenter is the cheapest way to find out whether a site accepts server traffic at all.

Datacenter proxies are the wrong choice for sites that block hosting ranges, and for anything that needs to look like a home user. For a broader take on that trade-off, read our comparison of datacenter and residential proxies.

Using ISP and datacenter proxies together

The two products don’t compete for the same job, so plenty of teams use both at once. A common split looks like this:

The logic is simple: spend residential or ISP money only where the network type actually matters. Keep an eye on which targets start challenging datacenter traffic, and move those, rather than paying the higher rate across the board. The ISP vs datacenter proxies decision is usually made site by site, not once for the whole company.

Limits of both proxy types

• Country-level targeting only. Both are normally sold by country. If you need a specific city, region, ZIP code or ISP, use rotating residential proxies instead.
• One IP, one reputation. Everything you do through a fixed ISP address is tied to it. If it gets flagged, you need a replacement IP, not simply the next one in a pool.
• Not invisible. As the database fields above show, IP-intelligence services try to flag proxies directly, whatever the network type. Behaviour still matters.
• Some sites are off limits. At ProxyEmpire, financial, government, crypto exchange, bank and payment sites are blocked on every proxy type. Unblocking a site needs KYC and a use-case review; see the help-centre page on blocked websites.
• Web ports only by default. ProxyEmpire opens ports 80 and 443 by default, and no proxy type carries UDP, so plan for web traffic rather than games or email.
• Not a way around the rules. A steady address makes an account look consistent; it doesn’t change what a platform allows. Its terms still apply.

ProxyEmpire’s ISP and datacenter proxies

Static residential IPs are sold in 24 countries only, including the United States, the United Kingdom, Germany, France, Canada, Japan and Australia; check the full list on the static residential proxies page before you buy. ProxyEmpire’s datacenter product is rotating and billed per gigabyte; it does not sell dedicated per-IP datacenter addresses, so if you need a fixed IP of your own, the static residential product is the one to buy. Details of the datacenter plans are on the rotating datacenter proxies page.

Both products use username and password authentication, and the same ProxyEmpire account covers datacenter and residential products, so you can run datacenter, ISP and rotating residential traffic side by side. The network runs at 99.9% uptime on the public status page, and support is available 24/7 from real people.

ISP and datacenter proxy FAQ

References

1. MaxMind — GeoIP web services responses: user_type, is_hosting_provider and is_residential_proxy. dev.maxmind.com/geoip/docs/web-services/responses
2. IP2Location.io — IP geolocation reference: usage_type codes and is_proxy. ip2location.io/ip-geolocation
3. IPinfo — ASN API: the ASN type field. ipinfo.io/developers/asn
4. IETF — RFC 1930, “Guidelines for creation, selection, and registration of an Autonomous System (AS)”. rfc-editor.org/rfc/rfc1930
5. IETF — RFC 7020, “The Internet Numbers Registry System”. rfc-editor.org/rfc/rfc7020
6. IETF — RFC 5737, “IPv4 Address Blocks Reserved for Documentation”, and RFC 5398, “Autonomous System (AS) Number Reservation for Documentation Use” (the example addresses and ASNs in Figure 1). rfc-editor.org/rfc/rfc5737