Private vs Shared Proxies: Who Else Uses Your IP?

You buy a proxy, receive connection details and start using an IP address. Who else can send requests from that address while you work? This is the difference that matters when comparing dedicated, semi-dedicated and shared access.

There is a second question: who used the address before you? And with mobile proxies, a third: does the service reserve the public IP or only the modem? These questions describe different parts of the purchase. Answering them makes the choice much clearer than looking for the word private in a product name.

This comparison is part of our proxy guide. Here we focus on access to an address: what you control, what remains shared and when exclusive use is worth paying for.

From one customer to open access

Think of an iceberg whose layers represent progressively wider access to a proxy. At the top, an address is reserved for one customer. Farther down, a small group shares it, then a larger or changing group. At the bottom, an open proxy has no closed customer group at all.

These layers show who can use a proxy. Their size does not represent market share, traffic volume or a website's trust in an IP.

Dedicated: one customer for the agreed period

A dedicated IP is reserved for one customer during the agreed period. Other customers of the proxy service cannot use that address while it is assigned to you. Your own team, applications and devices may all use it within the service's limits: one customer does not mean one person or one connection.

The provider may have rented the address to somebody else before and may reassign it after your rental ends. Exclusivity applies to the current assignment. The article on private proxies explains how this allocation works.

Semi-dedicated: a small, limited group

Semi-dedicated access means that a provider limits how many customers share an IP—for example, two or three in total. The actual limit belongs in the service terms: the name alone does not specify a number.

Read the count carefully. “Three customers per IP” and “shared with three other customers” describe different group sizes. Also establish whether the limit applies to everyone allowed to use the address or only to users connected at a particular moment.

Shared: several customers, with no standard group size

Shared access lets multiple customers use the same exit IP. A fixed package may contain addresses also issued to other buyers. A pool may select the same exit IP for different customers as requests arrive.

There is no industry-wide ceiling such as ten users. The group can be larger and can change over time. A service may state a limit or keep the allocation undisclosed. Our article on shared proxies covers how this works across network types.

Open / Public: no closed customer group

An open proxy can be used by anyone who knows its connection details and can reach it. Access is not reserved for a defined customer group. Its capacity is still finite: open access does not mean unlimited simultaneous connections.

This is a different operating model from a managed paid shared service. Public lists contain unavailable and short-lived addresses, and the list publisher may not control the servers. They are unsuitable as a dependable basis for regular work. The article on free public proxies explains the lists, their fields and their limitations.

Virgin IP: the address's past

A “virgin” IP is presented as an address entering proxy use for the first time. A buyer has little way to verify that history. An address may be new to one provider's inventory even if another service has already used it as a proxy.

It also need not be an address that has never carried internet traffic. Before becoming a proxy, it may have belonged to another service, company or subscriber. “First used as a proxy,” “never rented by this provider” and “not currently blocked by this website” are three different statements.

That is why Virgin belongs beside the top of the iceberg as a note about history. A virgin address can be assigned to one customer or introduced into a shared pool. A dedicated address can have a long previous history. Once an address enters use, its history starts changing.

For a purchase, establish both the claimed history and the current access arrangement. Even a first-use proxy address retains its network origin. A website that restricts its network can refuse it before that address has built any proxy history of its own.

What does “private” actually promise?

Many sellers use private and dedicated as synonyms. Others use private for restricted access that still involves a few customers. A personal password also does not establish exclusive use of the exit IP: it can identify your account on a shared service.

The useful description is specific: “This public exit IP is assigned only to your account for the rental period.” If the offer instead reserves a port, session, modem or access to certain websites, identify that resource before comparing it with a dedicated-IP package.

Static is another separate property. A shared IP can stay unchanged throughout your rental. A provider can also reserve a set of addresses for you and rotate requests within that set. Keeping an address and keeping other customers off it are different requirements.

What changes when an IP is yours alone?

Compare dedicated and paid shared public IPs of the same network type:

Control over requests to the same website

With a dedicated IP, you can coordinate every application using that address. If the website counts requests by IP, you decide how your own tasks share its allowance. On a shared IP, another customer's requests to that website may contribute to the same limit.

The overlap matters as much as the headcount. A small group heavily accessing the same website may interfere with each other more than a larger group visiting unrelated sites. Website rules differ too: some count by IP, while others also distinguish accounts, cookies or other request details.

It is easier to investigate failures

With an IP reserved for you, other proxy customers' current requests can be excluded as a cause of a new restriction. You can compare the website's responses with your applications' logs. On a shared address, other customers may also be sending requests that you cannot see or control.

Old restrictions and network-wide rules still matter. Reserving an IP does not remove an earlier block, change its hosting classification or move it outside a restricted address range. A dedicated package is useful when unwanted sharing is the problem; a different network may be needed when the website rejects the network itself.

Price and capacity are separate decisions

For otherwise comparable offers, sharing usually lowers the price per address. The same budget may buy a larger shared list, which can be useful for checking public pages across many addresses when those pages accept the service.

A dedicated IP can still run on a server used by other customers through different IPs. Its bandwidth and processing capacity may remain shared. Paying for exclusive use of the address therefore does not by itself reserve a faster connection. Compare capacity and performance separately from the access model.

Residential pools: different customers can use the same IP

An ordinary residential pool gives customers access to available household connections. The service selects a device that meets the request's conditions. Different customers can use its public IP; reserving that address exclusively for one buyer is not the usual arrangement.

An IP that stays online and matches a popular country, city or internet provider may be selected repeatedly for different customers, including at the same time if the service allows it. A large advertised pool does not tell you how many suitable IPs are available under your filters right now.

Narrow filters leave fewer eligible IPs. How much those IPs are shared depends on both their availability and customer demand. A less popular location may have fewer requests but also fewer connected devices.

A sticky session asks the service to keep the selected exit IP for your requests. It does not, by itself, prevent other customers from using that IP. Some offers reserve addresses for particular domains; check which websites that exclusivity covers. Even with many customers, a closed residential pool remains a paid shared service with controlled access.

Mobile proxies: a dedicated modem can have a shared IP

Mobile proxies can involve two separate groups of users. The proxy service decides who uses its modem or phone. The mobile carrier decides how its subscribers reach the internet.

With a dedicated modem, one proxy customer controls access to that device. With a shared modem, several proxy customers use its cellular connection. In a shared-modem service that lets customers trigger reconnection, one customer's action can interrupt the others. This particular issue concerns control of a common mobile device.

CGNAT adds sharing inside the carrier's network. Several subscribers can reach the internet through one public IPv4 address even when they use different devices. Reserving a modem does not reserve that public address. The other subscribers need not use proxies at all, and the proxy provider does not determine their number.

This form of sharing sits outside the iceberg’s main scale. The proxy service reserves the modem for one customer; the carrier still shares the public address. This does not make the proxy open to outsiders.

Why might a website accept a widely shared mobile IP?

A mobile carrier address can represent many ordinary subscribers. Blocking everyone behind it can affect legitimate visitors, so a website may distinguish visitors using session information and other signals. Some protection systems explicitly support this approach for users behind NAT.

This helps explain why the number of people behind an address is not a reliable ranking of website acceptance. Mobile network origin can matter more than exclusive allocation in a particular task. The actual result depends on the website and the requests: CGNAT does not grant unlimited access or immunity from restrictions.

When to choose dedicated or shared access

Choose dedicated access to control activity on a particular IP

Dedicated access is valuable when you want only your team and applications to use an address. You may need to coordinate recurring work on the same website, investigate changes without unknown proxy customers in the picture, or use an IP allowlist on a service you control. In the allowlist case, exclusive allocation avoids admitting unrelated customers through the same allowed address; normal account authentication is still needed.

If the work also needs an unchanged address, require both fixed assignment and exclusive use. For a mobile offer, decide whether control of the modem is sufficient or whether the task truly needs an exclusive public IP.

Choose shared access when the task works reliably without exclusivity

For public-page checks, price monitoring or testing across locations, a suitable managed shared service may provide everything required. If the pages open correctly at the intended workload and the timing suits the task, paying to reserve the same addresses may add little value.

Compare packages for the same period and count the IPs that work on the websites you need. A lower price per advertised IP is less useful when many addresses cannot perform the task. Keep network type and geography comparable; otherwise the price difference may reflect a different product altogether.

Change the property that causes the problem

If your IP keeps changing, look at address retention. If the website rejects hosting networks, look at network origin. If transfers are slow, investigate capacity and the route. Dedicated access addresses who else may use a resource; it is worth paying for when that is the part you need to change.

Four questions that make an offer clear

1. What exactly is reserved? The public exit IP, a modem, a port or access to particular websites?
2. Who else can use it during my rental? Nobody, a stated maximum group, or an undisclosed number of customers?
3. What is known about its previous use? Is “new” about the provider's inventory, proxy history or a recent check against specific websites?
4. Does the promised resource solve my task? Check the required pages and actions in your application, using the intended network, locations and workload.

The answers turn a label into a useful description: an address reserved for you, an address shared within a stated group, access to a changing pool, or a dedicated device behind the carrier's shared public IP.