What Is a Residential Proxy? Why Offerwalls Block It

Key takeaways

A residential proxy sends your traffic through someone else's home internet connection, so websites see a home IP address in the country you picked instead of your own.
Many residential proxy IPs come from apps, free VPNs, and cheap devices that enroll people's connections without clear consent, which is why security teams and law enforcement have taken whole networks down.
No single check catches every residential proxy, so detection combines IP reputation, network type, behavior, and device consistency, and publishers should block the wall on proxy traffic but review accounts before banning.

What is a residential proxy?

A residential proxy is a server that forwards your internet traffic through a real household connection, such as someone’s home Wi-Fi router, phone, or TV box. The website you visit sees that household’s IP address, which belongs to an ordinary internet provider in a country you choose, instead of your own address. Because the traffic looks like it comes from a normal home user, residential proxies are much harder to spot than VPNs or datacenter proxies, and that is exactly why rewards sites, offerwalls, and ad platforms treat them as a fraud risk.

This page covers the proxy types, where the addresses come from, how detection works in general terms, and what you should do as a publisher. It is general information, not legal advice.

Residential vs datacenter vs mobile proxies, VPNs, and Tor

All five of these hide the user’s real IP address. They differ in whose address the website sees, and therefore in how easy they are to recognize.

Type	Whose IP the site sees	Typical honest use	How easy to detect
Datacenter proxy	A server at a hosting or cloud company	Automated testing, scraping public data, company gateways	Easy: the address belongs to a hosting network, not a consumer internet provider
Residential proxy	A home connection of a stranger, through their router, computer, phone, or TV box	Ad verification, price and search result checks from other countries	Hard: the address belongs to a normal home provider and often rotates
Mobile proxy	A phone or SIM modem on a 4G or 5G carrier network	Testing mobile ads and app store listings by country	Hardest to block: carriers share one address among many real customers
VPN	The VPN company’s server, usually in a data center	Privacy on public Wi-Fi, company remote access	Moderate: known VPN server ranges and hosting networks give it away
Tor	A volunteer-run Tor exit relay	Anonymity for journalists, activists, and people under censorship	Easy: the Tor Project publishes its exit addresses

Two terms you will meet: a rotating proxy changes the exit address on every request or every few minutes, so one user can look like hundreds of households, and a sticky session keeps one address for a set time, so a sign-up looks like one consistent visit.

The mobile row deserves a closer look. Mobile carriers usually put many subscribers behind carrier-grade NAT, and the internet standard for it, RFC 6888, says plainly that a public IPv4 address is shared by many subscribers. The companion document RFC 6269 on IP address sharing warns that blacklisting a shared address restricts every subscriber behind it, and that “penalty box” blocking simply will not work with large-scale sharing. So blocking a mobile proxy address also blocks real customers of the carrier.

Tor is the opposite case. Anyone can download the current list of exit addresses from the Tor Project’s bulk exit list, so a site that does not want Tor traffic can recognize it with certainty.

Where residential proxy IPs come from

A residential proxy network needs millions of real home connections. Providers usually say they get them with consent, for example from people paid to install a “share your bandwidth” app. Security research and court cases show that much of the supply comes from owners who did not clearly agree.

Proxy SDKs inside ordinary apps

The most common route is a software development kit that app developers add in exchange for money. In its January 28, 2026 report on disrupting the IPIDEA proxy network, Google’s Threat Intelligence Group says IPIDEA paid developers, usually per download, to put its SDKs in their apps, and that the SDKs enrolled users’ devices into the network. Google found more than 600 apps with code connecting to the network’s control servers, most of them harmless-looking utilities, games, and content apps, and says many did not disclose that they turned the device into a proxy. Some free VPN apps did the same without clear disclosure.

Google took down control domains and made Google Play Protect warn users, remove apps known to contain IPIDEA SDKs, and block future installs, which it says cut the operators’ device pool by millions. In one week in January 2026, it saw more than 550 threat groups it tracks using IPIDEA exit addresses to hide their activity.

Malware and pre-infected devices

The second route is plain malware. The US Department of Justice announced in May 2024 that it had dismantled the 911 S5 botnet, a residential proxy service linked to more than 19 million unique IP addresses. According to the court documents, the malware spread through free VPN programs and through bundles with pirated software, and buyers used the proxies for crimes including large-scale fraud against pandemic relief programs.

The FBI’s June 2025 public service announcement on BADBOX 2.0 describes another source: cheap TV streaming boxes, digital projectors, car infotainment systems, and picture frames that were compromised before sale or during setup and then used for residential proxy services. Warning signs the FBI lists include devices sold as “unlocked” for free content, setups that ask you to disable Google Play Protect, and Android devices that are not Play Protect certified.

Why “ethically sourced” is not proof

Google’s IPIDEA report says many providers claim to source their IPs ethically but that these claims are often incorrect or overstated, and that any such claim must be backed by transparent, auditable proof of user consent. If you ever evaluate a proxy provider for a legitimate project, ask for that proof.

Are residential proxies legal, and who uses them honestly?

In most countries, using a proxy is not illegal in itself. What can make it illegal is how the network got its devices and what the traffic is used for. Enrolling devices without the owner’s permission can be computer crime: the administrator of 911 S5 was charged with offenses including computer fraud and money laundering. Using any proxy to commit fraud is fraud regardless of the tool. Separately, many websites and services forbid proxies in their terms, so using one there can cost you the account even where no law is broken. If you need a firm answer for your country or use case, ask a lawyer.

Legitimate uses do exist: ad verification (checking that an ad appears correctly in a given country), price and search monitoring, localization testing of sites and checkouts, and security research. Still, Google’s researchers write that their research shows these proxies are overwhelmingly misused by bad actors. And on a rewards site there is no legitimate reason for an end user to earn through one.

Why rewards fraud and ad fraud rely on residential proxies

Rewards sites and offerwalls pay real money for real actions, so they draw the same people who abuse ad systems. Residential proxies help them in four ways:

Faking the country. Advertisers pay more for users in some countries and often pay nothing for others. A proxy lets someone in one country appear to be in a higher-paying one. Offers depend on the user’s location, which is why incentivized traffic partners check it so carefully.
Running many accounts. A rotating proxy gives every account its own clean-looking household address, which defeats simple “one account per IP” rules. Stop multi-accounting and VPN abuse covers the account side.
Hiding automation. Bots that sign up, click, or install from one datacenter are easy to spot. Spread across thousands of home addresses, they look like a crowd. Ad fraud and bot traffic explains the wider schemes.

The same infrastructure powers ad fraud at scale. In July 2025 Google sued the alleged operators of BADBOX 2.0 and, as SecurityWeek reported, accused them of selling access to infected devices as residential proxies and of using the devices to create fake ad views and exploit pay-per-click models.

Results from proxy traffic usually end in a reversal. For the publisher whose wall the traffic came through, that means lost earnings and a rising reversal rate, which makes partners trust all of its traffic less.

How residential proxy detection works

A residential proxy borrows a real home address, so no single test identifies it. Detection systems combine signals and look for the point where the story stops adding up. In general terms:

IP reputation

Services that watch traffic across many sites see the same address appear in sign-up abuse, scraping, credential attacks, or known proxy pools. An address with that history gets a worse score, even if it belongs to a home provider. What is IP reputation? explains how these scores are built and why they decay over time.

Network and ASN

Every IP address is announced by an autonomous system (AS), 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. Knowing the AS tells you whether an address belongs to a consumer internet provider, a mobile carrier, a hosting company, or a business. Datacenter proxies and most VPNs fail here. Residential proxies pass, which is why the other signals matter.

Behavior

Real users do not change country between two page loads, complete ten offers in four minutes, or follow the same click path as fifty other accounts. Those patterns are strong hints whatever the IP looks like.

Device and fingerprint consistency

The proxy changes the address, not the device. If one browser or phone shows up behind many households in different cities, or a device’s time zone and language do not match the country of its address, something is off. What is device fingerprinting? covers how these signals work and why they are evidence rather than proof.

Illustrative example: one session, four signals

A user opens an earn page from a home broadband address in Canada. The address belongs to a consumer provider, so the network check passes. But the address appeared in a known proxy pool last week, the device reports a time zone eight hours away from Canada, and the same device logged in from a German home address earlier that day. No single fact proves anything; together they say the visit should not reach the offers. Sample scenario only, not real data.

The limits

Detection is a probability, and it errs in both directions. A fresh proxy address with no history can slip through, and an honest customer can inherit a bad address from whoever had it before, or sit behind a shared carrier address that someone else abused. Good systems therefore block the risky moment, such as opening an offerwall or cashing out, rather than banning people permanently on one signal.

What publishers should do

You cannot detect every proxy yourself, and you do not need to. Your job is to make proxy abuse unprofitable on your side and to treat honest users fairly.

Put it in your rules. Say clearly that VPNs, proxies, and other tools that hide a user’s location are not allowed while earning, and that rewards from reversed offers are taken back. Our traffic quality rules show the standard Sharklio publishers follow.
Check at the moments that matter. At sign-up and every cashout, compare the IP country with the account country, the device language and time zone, and the payout method.
Link accounts by more than IP. Proxies make IPs cheap, so link accounts by device, payout destination, and referral chain.
Hold new earnings. A short hold before withdrawal gives advertisers time to reverse bad results before the money leaves.
Credit only from signed postbacks. Never credit from the browser, and take rewards back when a reversal arrives. Postback security explains how.
Watch your reports by country. A sudden jump in one high-paying country, with no change on your side, is the classic sign of location fraud.

Mistakes that cost honest users or help abusers

Banning accounts on a single proxy flag, blocking whole mobile carriers, publishing exactly which checks you run, and telling users which proxy types “still work”. The first two hurt real customers; the last two hand abusers a map.

When an honest user is flagged as a proxy

It happens, and the reasons are usually mundane: an address the provider shares among many customers, an address someone else abused before, or a VPN or proxy browser extension left on. Less often, their own device is the proxy: a free VPN, a “share your bandwidth” app, or an uncertified TV box may be selling their connection, exactly as the Google and FBI reports describe. Google notes that people whose devices become exit nodes can end up flagged or blocked by other services.

Give flagged users a clear message and a path forward, not a silent failure. On walls powered by Sharklio, users can follow the connection help page, which walks through turning off VPNs and proxy settings, getting a fresh address from the router, and asking the provider for a public IP. Facts about the reports above checked on October 22, 2026.

How Sharklio handles proxy traffic

Sharklio is a pay-per-result affiliate network, and publishers run it through an offerwall, an Offers API, or SDKs for Android, iOS, Unity, Flutter, and React Native. Users on VPNs, proxies, Tor, or data center networks are blocked from the wall before they see an offer, and the offers shown depend on the user’s country and device. Every credit and every reversal reaches your server as a signed server-to-server postback, and your reports break results down by country, offer, and sub ID, so location fraud shows up quickly. Every publisher application is reviewed by hand. Read how Sharklio checks traffic quality, see how the wall works, or get in touch.

Frequently asked questions

What is the difference between a residential proxy and a datacenter proxy?

A datacenter proxy uses an address owned by a hosting or cloud company, so sites can recognize it from the network it belongs to. A residential proxy uses an address that a consumer internet provider gave to a real household, so it looks like ordinary home traffic and is much harder to detect.

Is a residential proxy the same as a VPN?

No. A VPN encrypts your traffic to the VPN company’s own servers, which usually sit in data centers. A residential proxy forwards your traffic through other people’s home connections, so websites see a household address instead of a server.

Are residential proxies legal?

Using a proxy is generally not illegal in itself, but enrolling devices without the owner’s permission can be a crime, and using any proxy to commit fraud is fraud. Many websites also ban proxies in their terms. This is general information, not legal advice.

What is a mobile proxy?

A mobile proxy routes traffic through a phone or SIM modem on a 4G or 5G network. Because carriers share one public address among many subscribers, blocking a mobile proxy address can also block real customers, which is why sites rely on behavior and device signals instead.

Can websites detect residential proxies?

Often, but not always. Detection combines IP reputation, the type of network an address belongs to, behavior such as location changes within a session, and whether the device’s settings match the address, and a fresh address with no history can still slip through.

Why does an offerwall say proxy detected when I am at home?

Your provider may share one address among many customers, someone may have abused your address before, or a VPN, browser extension, or bandwidth-sharing app may be active on your device or network. Turning those off and restarting your router for a new address usually fixes it.