What Is a Shared Proxy?
A shared proxy is any proxy that allows multiple people to share the same IP — or IP pool — at once. While many proxy types technically meet that description, what the term generally refers to is a proxy shared by more than one user for the purpose of online anonymity.
What this means is that most websites talk about shared proxies in function of where they source their IP from, i.e. a datacenter, mobile, or residential source.
In this article we'll discuss where shared proxies fit in the proxy ecosystem, why people use them and what for, what other types of proxy may fit the shared proxy definition, and what sets them apart as a distinct category.
Shared proxies can be useful for low-risk browsing or basic testing, but they are not always the best fit for performance-sensitive workflows. If you need more control, compare them with dedicated proxies and datacenter proxies. For scraping use cases, our guide on the best proxies for web scraping explains when shared infrastructure becomes a limitation.
How Do Shared Proxies Work?
If a proxy server is an intermediary you connect to in order to borrow its IP and geolocation, then a shared proxy is a server that multiple people connect to at once. Traffic is rerouted through the proxy, queued, forwarded, and the responses are routed back to the right user.
Connection multiplexing
The server juggles simultaneous requests via multiplexing, keeping users' concurrent sessions separate. HTTP/2 made this possible by allowing multiple requests and responses over the same TCP connection. Each session is tagged so the server can sort out whose traffic is whose. SOCKS5 supports multiplexing too, letting TCP and UDP pass through the same connection.
Resource efficient by design
Doing it this way cuts down on latency compared to processing each request and response in sequence — and avoids constantly opening and closing connections. That efficiency is the whole reason providers can offer thousands of IPs at low per-user prices.
Scaling through reverse proxies
By placing reverse proxies between the user and the shared pool, providers efficiently allocate resources, prevent any one server from getting overloaded, and redirect traffic when a server fails. The whole system scales up and down as demand shifts.
IP rotation by source
Beyond pool access, individual proxies can rotate automatically as a consequence of their IP source. Mobile proxies rotate most frequently, residential proxies next most, and datacenter proxies may rotate or be static.
What Are the Pros and Cons of Shared Proxies?
The combination of low initial investment and a large pool of proxies makes shared proxies attractive to anyone who prioritizes price and IP diversity above all else. The same things that make them shine are also the source of their drawbacks.
Cost effective
Shared proxies allow multiple users to share the infrastructure otherwise allocated to a single user. This inherently brings cost benefits, which is why shared proxies are significantly cheaper — sometimes by a factor of 100.
Accessible
Shared proxies offer access to up to tens of thousands of IPs almost instantly.
Convenient billing
Most providers operate on a pay-as-you-go or pay-by-the-GB model, only charging for data used rather than access to specific proxies.
Bandwidth overload
Everyone connecting to a shared proxy is sharing the same resources. The server has to allocate enough bandwidth and processing power to everyone, which can result in slower speeds and less reliable proxies — particularly for popular servers or locations.
Bad neighbors
Most proxy use cases are web automation and web scraping, and not everyone successfully avoids the ire of websites' anti-bot measures. This can result in IPs being flagged and placed on blacklists or blocked.
Flagged IP history
The problem can be compounded by explicitly bad actors capitalizing on shared proxies' accessible price. Their actions trip anti-fraud measures and land IPs on more serious blacklists, leading to lower quality and more CAPTCHAs.
When Should You Use a Shared Proxy?
Their affordable price relative to more exclusive proxies makes shared proxies a great entry point for a range of web automation. Where they shine is when the target is forgiving and budget matters more than peak success rate.
Low-intensity scraping
The lowest intensity automation can in theory take place from your own IP at first. You'll eventually want a different IP as your project scales — either to protect your own IP, or because you've already been blocked. Shared proxies are an affordable next step.
Small business price monitoring
If you're a small business, you might not be able to directly compete with multinational ecommerce platforms. Routinely scraping local competitors for market research and price monitoring can make a shared proxy useful without the higher price point of a dedicated proxy.
Geo-targeted access
When you need a proxy in a specific country (e.g. to access geo-restricted content) and can sacrifice quality for it, shared proxies are a good fit. Many obscure social media sites also lack aggressive anti-bot measures, so a shared proxy might be all you need.
Shared Proxy Alternatives
You've tried a shared proxy and you want more — faster speeds, higher quality proxies, more control. If a shared proxy is one extreme of the spectrum, dedicated and private proxies are on the other end.
Shared proxies, summed up
In short, shared proxies are a cost-effective entry point for using proxies in practice. They're cheap, plentiful, and if you accidentally scrape far too much data from a website you won't break the bank. They let you hide your real IP address, and providers maintain a very large pool of shared IPs from across the world that are ideal for low-intensity automation.
On the other hand, shared proxies are unlikely to be fast. They're also much more likely to have been flagged in the past, making it likely that they've been blocked by many of the most popular websites. On top of that, their presence on blacklists may lower the barrier for less strict sites to impose rate limits or IP bans.
Key takeaways
What to remember about shared proxies
- Cheap, plentiful entry point for hiding your real IP
- Large global pools — ideal for low-intensity automation
- Unlikely to be fast at peak load due to shared bandwidth
- Higher chance of carrying flagged or blocked IP history