A proxy sits between your device and the internet, forwarding your requests through a different IP address. The websites you visit see the proxy's IP, not yours. That's the simple version. What actually matters for most professional use cases is the type of IP the proxy uses, because that determines whether the target site treats your request as a real user or a bot.
What a residential proxy is
A residential proxy routes your traffic through an IP address that an internet service provider assigned to a real household. When you make a request through a residential proxy, the target website sees a home internet connection in a real location, registered to a real ISP. To most detection systems, it looks identical to a real person browsing from that address.
Residential proxy networks are built by aggregating IP addresses from real devices, usually through software installed on home computers and mobile devices whose owners have opted in (though the terms of some services have been controversial on this point). The network might have tens of millions of IPs spread across countries, cities, and ISPs.
This scale matters because rotating between many different residential IPs distributes request volume in a way that's hard to distinguish from organic traffic across many real users.
What a datacenter proxy is
A datacenter proxy routes traffic through an IP address registered to a commercial hosting company, cloud provider, or data center. These IPs are owned by companies like Amazon Web Services, Digital Ocean, OVH, or dedicated proxy hosting firms. They're fast, cheap, and reliable.
The problem is that their origin is immediately visible to anyone who checks. Commercial hosting company IP ranges are publicly documented. Websites with bot detection systems maintain blocklists of known datacenter IP ranges and reject or challenge requests from them automatically. A datacenter IP that gets flagged on one site is likely already on shared blocklists used by other sites in the same industry.
How websites tell them apart
The primary method is checking the Autonomous System Number, or ASN, associated with the IP address. Every IP block is registered to an AS, and each AS is publicly listed with its organization name. An IP owned by Digital Ocean or Amazon Web Services has a recognizable commercial ASN. An IP assigned by Comcast or BT to a residential customer has a residential ISP ASN.
This check takes milliseconds and is built into most modern bot detection stacks, including services like Cloudflare, Akamai, and Imperva. Sites that use these services block datacenter IPs at the CDN level before the request ever reaches the application.
Secondary detection signals include browser fingerprinting (automated requests often lack the headers, cookies, and JavaScript execution patterns of real browsers), request timing and volume patterns, and missing web history signals that real users accumulate over time.
When datacenter proxies are the right choice
Datacenter proxies aren't obsolete. For use cases where the target site doesn't have aggressive bot protection, they're faster, significantly cheaper, and more reliable than residential alternatives.
Scraping publicly available data from government sites, academic databases, or simple content sites that don't invest heavily in bot protection works fine with datacenter proxies. Large-scale keyword rank tracking on search engines that allow automated queries uses datacenter IPs without issue. Internal testing and development work that doesn't involve production bot-detection systems doesn't require the premium residential option.
Cost is the main argument. Datacenter proxies typically run $1 to $3 per gigabyte. Residential proxies run $5 to $15 per gigabyte from reputable providers. At high data volumes, that difference is material.
When residential proxies are necessary
Any target site with active bot detection effectively requires residential IPs to function reliably at scale.
Ecommerce price monitoring is the most common use case. Retailers like Amazon, Walmart, and most large online stores have extensive bot protection because their pricing data is competitively sensitive and they actively try to prevent scraping. Residential proxies are the standard infrastructure for competitive price intelligence in ecommerce.
Social media data collection requires residential IPs because platforms apply aggressive rate limiting and IP blocking to automated access. Datacenter IPs get banned quickly on most social platforms regardless of request volume.
Ad verification, which involves checking that ads are displaying correctly across geographic locations and device types, uses residential proxies to simulate real user traffic from real locations. The point is seeing what a real user would see, which requires an IP that looks like one.
Brand protection monitoring, checking whether counterfeit products or unauthorized sellers are using a company's branding on marketplaces and classified sites, requires residential IPs to access the pages that real buyers see rather than bot-filtered versions.
ISP proxies: the middle option
A third category sits between the two. ISP proxies, sometimes called static residential proxies, use IP addresses that are registered to real internet service providers but are hosted in data centers rather than actual homes.
The advantage is a legitimate ISP-registered ASN that avoids the most common blocklists, combined with the stability and speed of datacenter infrastructure. Unlike rotating residential proxies, ISP proxies use a fixed IP that doesn't change between sessions, which matters for use cases that require consistent identity across multiple requests to the same site.
They're priced between datacenter and residential: typically $2 to $6 per gigabyte depending on the provider. The right choice between ISP proxies and fully residential proxies depends on how sophisticated the target site's detection is. ISP proxies pass most checks; the most aggressive bot detection systems can still identify them as datacenter-hosted.
Frequently Asked Questions
What is the difference between a residential proxy and a datacenter proxy?
A residential proxy routes traffic through an IP address assigned by a real internet service provider to a home connection. It appears to websites as a regular user. A datacenter proxy routes traffic through an IP address owned by a commercial hosting company. These IPs are easily identified as non-residential and are blocked more aggressively by sites with anti-bot protection.
When should you use a residential proxy instead of a datacenter proxy?
Use a residential proxy when the target site has active bot detection that blocks known datacenter IP ranges, when you need to appear as a real user in a specific geographic location, or when accessing platforms that rate-limit or ban non-residential traffic. Common use cases include scraping ecommerce sites, social media management at scale, and ad verification. Datacenter proxies are better when speed and volume matter more than detection avoidance, and the target site has minimal bot protection.
How do websites detect datacenter proxies?
Websites identify datacenter proxies primarily through the Autonomous System Number (ASN) associated with the IP address. Datacenter IPs are registered to known hosting companies like Amazon Web Services, Digital Ocean, or OVH, and their IP ranges are publicly documented and maintained on IP blocklists. Response time patterns and missing browser fingerprint signals also flag automated traffic regardless of proxy type.
What is an ISP proxy and how does it differ from a residential proxy?
An ISP proxy uses an IP address assigned by a real internet service provider but hosted in a data center rather than a home. It combines the legitimacy of an ISP-registered IP with the speed of datacenter infrastructure. Unlike rotating residential proxies, ISP proxies use a fixed IP that doesn't change between sessions. They are more expensive than datacenter proxies but less expensive than high-quality rotating residential proxies.