Use a datacenter proxy by default. Switch to a residential proxy only when the target site blocks datacenter addresses and you have confirmed that the IP address is the reason. Datacenter proxies are faster, more stable and much cheaper. Residential proxies get through more often on heavily protected sites, but they are slower and usually billed per gigabyte of traffic.
That is the whole decision in most cases. The cheapest proxy that returns correct pages is the right one, because a more expensive proxy returns the same data. The rest of this article explains what a site actually checks, which of those checks a proxy can change, and when you need no proxy at all.
What the two types are
A datacenter proxy routes your request through a server in a hosting facility. The IP address belongs to a cloud or hosting company. These addresses are plentiful, the connections are fast, and providers often sell them per address or with generous traffic allowances.
A residential proxy routes your request through an address that an internet provider assigned to a home connection. To the target site, the request appears to come from a household. These addresses are harder to obtain, the connection depends on someone's home line, and the pricing reflects that. You normally pay for every gigabyte that passes through.
There are two more variants. ISP proxies, sometimes called static residential, are addresses registered to a consumer internet provider but hosted on servers. They sit between the two types in both price and trust. Mobile proxies use addresses from cellular networks. They are the most expensive and are rarely needed for public web data.
One point about residential networks deserves care. The addresses belong to real people. Reputable providers get consent from those people and pay them or offer a service in return. If you buy residential traffic, check how the provider sources its addresses.
Why sites can tell them apart
Every IP address belongs to a network, and every network has a registered owner. That information is public. A site can look up the network behind a request and see at once whether it belongs to a hosting company or a consumer internet provider.
Large cloud providers even publish their own ranges. Amazon documents its AWS IP address ranges as a downloadable file, and other clouds do the same. The lists exist for firewall configuration, but they also make it trivial to recognize cloud traffic.
So a site knows that almost no real shopper or job seeker browses from a server rack. Traffic from hosting networks is mostly automated. Some sites block it outright. Others let it through but score it as more suspicious, which means a challenge page or a stricter rate limit.
What blocks what
A proxy changes exactly one thing: the IP address the site sees. Blocking systems look at much more than that. Before you pay for residential traffic, work out which check is stopping you.
Network type. This is the check described above. If a site rejects every request from hosting networks, a datacenter proxy will fail no matter how carefully you behave. This is the one case where a residential or ISP proxy is the direct fix.
IP reputation. Protection services track how individual addresses have behaved across many sites. An address that sent abusive traffic yesterday is treated with suspicion today. Shared datacenter pools suffer from this more often, but residential addresses can have a poor reputation too.
Request rate. A site counts requests per address over time. Go too fast and you get slowed down or refused, often with the HTTP 429 Too Many Requests status. Rotating over more addresses spreads the load, and so does simply sending fewer requests. Slowing down is free.
Client fingerprint. The way your software opens an encrypted connection reveals what kind of software it is. Cloudflare documents how it uses JA3 and JA4 fingerprints to identify clients from the TLS handshake. A plain HTTP library looks different from a browser, and no proxy hides that. If this is your problem, a residential address will be blocked just as quickly as a datacenter one.
Browser checks. Some sites run JavaScript that inspects the browser environment, then set a cookie that proves the check passed. A script that never executes JavaScript never gets the cookie. The fix is a real browser, not a different IP.
Behavior. Requesting a thousand detail pages in perfect sequence, with no pauses and no other assets, does not look like a person. Bot detection products combine these signals into a score. Cloudflare describes its bot score as an estimate of how likely a request is to be automated, built from several detection methods rather than one.
Geography. Some sites show different content per country, or refuse visitors from outside their market. Here you need an address in the right country. Both proxy types offer country selection, so this alone is no reason to go residential.
Login. If the data sits behind an account, the block is authentication. No proxy solves that, and we will come back to it below.
A cheap order to test in
Most people reach for residential proxies too early. A more economical routine looks like this.
- Try without any proxy, at a polite rate, from your own connection. Many sites serve public pages to a well-behaved client without complaint.
- If you are blocked, read the response. A 429 means you are too fast. A 403 or a challenge page means something about your client or address is distrusted.
- Fix the client first. Send realistic headers, keep cookies between requests, and use a real browser if the site needs JavaScript.
- Add datacenter proxies if you need more volume than one address can politely handle, or a different country.
- Move to residential only when the same request succeeds from a home connection and fails from every datacenter address you try. That comparison is the proof that network type is the cause.
Step five matters because residential traffic is metered. If you load full pages in a browser, with images and scripts, the gigabytes add up quickly. Blocking images and fonts reduces the bill. Fetching a site's underlying JSON endpoint instead of the rendered page reduces it far more, when such an endpoint is publicly reachable.
You can also mix types. Some setups use a residential address only for the first request that earns a session cookie, then continue on cheaper addresses. Whether that works depends on whether the site ties the cookie to the IP.
What a proxy cannot give you
A proxy shows you what an anonymous visitor in that location would see, and nothing more. This limit is easy to forget.
On a job board, a visitor who is not logged in can normally see the public listing: title, company, location, description and posting date. That visitor cannot see applicant counts reserved for members, recruiter contact details behind an account, saved searches, or anything in an employer dashboard. Salary is a common gap. Many listings carry no salary at all, and some sites show an estimate rather than a figure from the employer. A dataset built from public pages inherits those gaps.
The same applies to review sites and company profiles. Public pages often show a limited number of results per search, and deep pagination may stop before the real end of the list. Search results can differ by country and by device. Expired listings disappear. Any scraped dataset is a snapshot of what was publicly visible at that moment, and you should describe it that way to whoever uses it.
Proxies also do not change what you are allowed to do. Read the site's terms and its robots.txt file. The Robots Exclusion Protocol is defined in RFC 9309, and it is the standard way a site tells automated clients which paths it does not want fetched. Stay away from data behind a login unless it is your own account and the terms permit it, and handle personal data according to the privacy law that applies to you.
Free routes that beat any proxy
Before buying proxies, check whether you need to scrape at all.
Official APIs. Many platforms offer one. Government sources such as the SEC's EDGAR system provide free programmatic access with published fair-use rules. Some job boards and applicant tracking systems publish public feeds of their listings. An official API gives you structured data, stable fields and clear terms. When it covers the fields you need, it is the better choice.
Manual export. If the data is your own, such as your company's job postings, your reviews on a platform where you have a business account, or your CRM records, the platform usually has an export button. Use it. It is complete in a way no public page is.
Feeds and sitemaps. RSS feeds and XML sitemaps are meant for machines. They often list every public URL with a last-modified date, which removes the need to crawl search pages.
Just doing it by hand. For twenty listings once a quarter, a browser and a spreadsheet are cheaper than any tooling.
Scraping earns its place when no API exists, when the API omits the fields you need, or when you need many sources in one consistent format on a schedule. At that point the proxy question becomes real, and the answer is the one this article started with: begin with the cheapest option, measure, and upgrade only on evidence.
The short version
Datacenter proxies handle sites with light or moderate protection, at low cost and high speed. Residential proxies are for sites that reject hosting networks, and they are worth their price only there. Most blocks come from rate, fingerprint or missing JavaScript, and none of those are fixed by a more expensive IP address. Test in order of cost and stop at the first setup that returns correct pages.
If the data you want is German job listings and you would rather not manage proxies, browsers and retries yourself, our StepStone Jobs Scraper returns public listings as structured records and charges per result delivered, so you can run a small test first and see whether the output fits your use before you commit to anything larger.
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