GlossaryNetworkingBeginner

Proxy Server

A proxy server is a middleman between you and the internet. Your request goes to the proxy first, and the proxy forwards it on — so the website sees the proxy's IP address instead of yours.

Last updated July 29, 2026

Definition

A proxy server is a computer that sits between your device and the website you are trying to reach. Instead of connecting directly, your request goes to the proxy, the proxy passes it along, and the reply comes back the same way.

Think of it like a mail forwarding service. You post a letter to the forwarding company, they put it in a new envelope with their return address, and send it on. The recipient replies to that address, and the company forwards the reply to you. They never learn your home address — and neither does the recipient.

How a proxy request actually works

  1. You ask for a page, and your software sends the request to the proxy instead of the website.
  2. The proxy opens its own connection to the website, using its own IP address.
  3. The website responds to the proxy — as far as it knows, the proxy is the visitor.
  4. The proxy hands the response back to you.

The website only ever sees the proxy's IP, its location, and its reputation. Yours stays out of the conversation.

The main types, and when each fits

  • Residential — real IPs assigned by home internet providers. They look like ordinary people, so strict sites trust them. Slower and priced per GB.
  • Datacenter — IPs from hosting companies. Fast and cheap, but easy to identify and block on defended sites.
  • ISP (static residential) — hosted in a data centre but registered to an ISP. You get residential trust at datacenter speed.
  • Mobile — IPs from 4G/5G carriers, shared by many real subscribers. The hardest to block, and the most expensive.

Separately, proxies differ by protocol. HTTP proxies understand web traffic and can cache it. SOCKS5 proxies simply move packets, so they work with any kind of traffic — email, torrents, games — not just browsing.

What a proxy does not do

This is where most people get caught out. A plain proxy hides your IP; it does not encrypt your traffic. Anyone able to observe the connection — your network operator, your ISP — can still see where you are going unless the site itself uses HTTPS. A VPN, by contrast, encrypts everything between your device and the VPN server.

A proxy also usually applies to one app at a time, whereas a VPN normally covers your whole device. Pick a proxy when you need many different IPs and fine-grained control; pick a VPN when you want blanket encryption and privacy.

Rotating versus sticky

A rotating proxy hands you a different IP on every request, which spreads a large job across many addresses and keeps simple rate limits at bay. A sticky session holds the same IP for a set period, which is what you need for anything multi-step — logging in, filling a cart, checking out. Serious projects use both, matched to the task.

Examples

1

Setting a datacenter proxy in your browser so a website records the proxy's IP rather than your home connection

2

A price-monitoring script rotating through thousands of residential IPs so a retailer does not rate-limit it

3

Routing one social media account through its own sticky mobile proxy to keep it separate from your other accounts

4

A company forcing all staff web traffic through an internal proxy that logs and filters what employees can visit

Common Use Cases

Web scraping and large-scale data collection
Checking prices and search results as a local user in another country
Running multiple accounts without linking them by IP
Ad verification and brand-protection monitoring
Corporate filtering, logging and access control
Load testing an application from many different addresses

Frequently Asked Questions

A proxy replaces your IP address but does not encrypt your traffic, and it usually applies to a single app. A VPN encrypts everything leaving your device and covers the whole system. Use a proxy when you need lots of IPs and per-app control; use a VPN when you want privacy and encryption by default.
It hides your IP from the website you visit, which is not the same as anonymity. Cookies, browser fingerprinting, and account logins can still identify you, and your network operator can still see where you are connecting unless the traffic is encrypted.
Usually not. Free proxies are slow, heavily overcrowded, and frequently already blocked. More importantly you have no idea who runs them or what they do with the traffic passing through, so never send logins or personal data over one.
Match it to how well defended your target is. Residential or mobile IPs for strict sites, social platforms, and anything location-sensitive; datacenter IPs when you mainly need speed and volume against sites that do not check IP reputation closely.
HTTP proxies understand web traffic specifically and can inspect or cache it. SOCKS5 proxies just relay packets without interpreting them, so they handle any protocol — including email, torrents, and gaming — and tend to add less overhead.
A little, because your traffic takes an extra hop. Good datacenter and ISP proxies add very little latency; residential and mobile IPs are noticeably slower because the traffic travels through a real consumer connection.
Yes, in most countries proxies are ordinary networking tools used every day by businesses. What matters is what you do with one — you still have to respect each site's terms of service and any laws covering the data you collect.

Keep Learning

All terms

Residential Proxy

A residential proxy routes your traffic through a real home internet connection, so websites see an ordinary ISP customer rather than a server in a data centre.

Read definition

Datacenter Proxy

A datacenter proxy is an IP address belonging to a hosting company rather than an internet provider. It is fast, cheap and available in bulk — and instantly identifiable to any site that checks who owns the address.

Read definition

Forward Proxy

A forward proxy sits between you and the internet and makes requests on your behalf. It is the everyday kind of proxy — used to change your IP address, filter traffic, or reach blocked content.

Read definition

Reverse Proxy

A reverse proxy sits in front of web servers and answers requests on their behalf, then quietly passes them to the right backend — handling load balancing, caching, HTTPS and security along the way.

Read definition
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