ISP vs datacenter proxies: a test you can run before paying for either

You need an address that stays put: one login, one cart, one account that should look like the same visitor tomorrow. Every provider offers two kinds of static IP, ISP and datacenter, and describes both with enough adjectives to make the choice feel like a personality test.

It is not. There is one real difference between them, and you can find out whether it matters for your target by renting the cheaper one and pointing fifty URLs at it. This post explains the difference, what each costs here, and the test.

What is the difference between ISP and datacenter proxies?

Both are static IPs on servers in a data centre, rented per address for a term. The difference is who the address is registered to. A datacenter IP belongs to a block announced by a hosting company. An ISP IP belongs to a block announced by a consumer internet provider, even though the machine answering on it sits in a rack next to the datacenter ones.

The part that decides this is the ASN, the autonomous system number of the network that announces an address. Anyone can look it up for free, in a millisecond, and anti-bot systems do exactly that before they look at anything else. A hosting ASN says “probably a server”. A home broadband ASN says “probably a person”, and blocking people costs a site money, so it is treated with more care.

Everything else is the same. Both are hosted in data centres, both speak the same protocols (HTTP, HTTPS and SOCKS5), and neither rotates: the address is yours for the term, and it changes only if you change it.

Is an ISP proxy the same as a static residential proxy?

Yes. “Static residential” is the same product under a friendlier name. It is residential in the sense that an ASN lookup names a home ISP. It is not residential in the sense of running over someone’s home router: the bandwidth is wholesale and the server is always on. Our ISP proxy glossary entry puts it in one line: hosted in a data centre, registered to a consumer internet provider.

That also tells you where it stops working. A site that only checks the ASN lets an ISP proxy through. A site running a serious anti-bot vendor can look past the ASN, at signals that separate a hosted address from a home line, and an ISP proxy will not pass those. Nothing static will.

How much do ISP and datacenter proxies cost?

At the list prices on this page, the same. Both lines sell the same three plans at the same prices, on the same volume ladder. The table below is the whole comparison, and the price columns are twins on purpose.

If you arrived expecting ISP to cost double, it does not at the list prices on this page. That changes the question. You are not choosing between cheap and trusted; you are choosing which paperwork your target wants to see, and whether the country you need is on the list for that line. The locations page shows which countries each line covers, and they are not the same list.

For scale: a dedicated IP for 30 days costs the same as 0.58 GB of residential at the single-gigabyte rate, and it has no meter. If a static address gets your pages, it is almost always the cheaper route.

Are ISP proxies faster than datacenter proxies?

No, and they are not slower either. Both answer from a server in a rack with a wholesale uplink, so from your scraper’s point of view the speed is the same kind of number. Both are much faster than rotating residential, which travels over somebody’s home connection. On dedicated IPs of either line, a faster uplink is a paid add-on if you need one.

If an ISP proxy feels slower than a datacenter one on your job, the difference is almost always the route between you and the country you picked, not the line. Pick a country near the target’s servers and it goes away.

Which sites block datacenter proxies?

The ones that can afford to, and the ones that pay someone else to decide. Roughly:

• Usually block or challenge hosting ranges: large retail and travel sites with a commercial bot-protection vendor, ticketing and limited-release shops, social platforms, and anything with an account sign-in that the site guards closely.
• Usually do not care: public APIs that authenticate you by key, documentation and content sites, forums, open-data and government portals, and smaller shops that never installed a bot filter.

“Usually” is carrying a lot of weight in both lines. Two shops on the same platform can behave differently, and a site can switch vendors next month. That is why the list is a hint and the test is the answer.

How to test whether a site accepts datacenter IPs

The rule: rent the cheapest thing that could work and see if it does. Here that is one shared datacenter IP for 30 days at $2.10, which includes 1 GB of traffic, plenty for a test of 50 pages. The minimum top-up is $5 and the balance does not expire, so whatever is left over waits for the next job.

Put 50 URLs in sample.txt that look like your real job: the same page types, the same mix of listing and detail pages, the pages behind the actions you actually care about. Then save this as staticcheck.py:

import sys
import time
import requests

HEADERS = {
    "User-Agent": (
        "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 "
        "(KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36"
    ),
    "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
    "Accept-Language": "en-GB,en;q=0.9",
}
CHALLENGE_WORDS = ("captcha", "are you a robot", "unusual traffic", "verify you are human")


def verdict(resp):
    if resp.status_code in (403, 429):
        return str(resp.status_code)
    if resp.status_code != 200:
        return "other"
    head = resp.text[:30_000].lower()
    return "challenge" if any(w in head for w in CHALLENGE_WORDS) else "ok"


proxy = sys.argv[1] if len(sys.argv) > 1 else None
proxies = {"http": proxy, "https": proxy} if proxy else None
tally = {"ok": 0, "challenge": 0, "403": 0, "429": 0, "other": 0, "error": 0}
urls = [line.strip() for line in open("sample.txt") if line.strip()]

for n, url in enumerate(urls, 1):
    try:
        r = requests.get(url, headers=HEADERS, proxies=proxies, timeout=30)
        result = verdict(r)
    except requests.RequestException:
        result = "error"
    tally[result] += 1
    print(f"{n:>3}  {result:<9} {url}")
    time.sleep(2)

label = "own connection" if proxy is None else proxy.split("@")[-1]
print(f"\n{label}: {tally}  usable {tally['ok'] / len(urls):.0%}")

Run it twice, then maybe a third time:

python staticcheck.py                                   # 1. your own connection
python staticcheck.py "http://USER:PASS@IP:PORT"        # 2. the datacenter IP
python staticcheck.py "http://USER:PASS@ISP_IP:PORT"    # 3. only if 2 disappoints

The first run is the baseline, and it is not optional. It tells you what “fine” looks like for this target: if your own connection gets challenge pages, the words in CHALLENGE_WORDS are matching something harmless (a login form with a captcha widget, say) and you should tighten them before trusting the other runs. The two-second pause keeps the test polite, so a rate limit does not masquerade as an ASN block.

This is the same idea as the five-minute test in residential vs datacenter, pointed at a different question. That one decides between paying per gigabyte and paying per IP. This one assumes you already want a static address and asks which registration the target will accept.

How to read the result

• Datacenter usable share matches your baseline. The target does not care about the ASN, so either line gets your pages. At the same list price, pick by country, and read the next two sections if the address will carry a login.
• Datacenter gets 403s from the very first request. That is an ASN filter: the site decided before it saw anything you sent. Run the ISP check. If ISP matches the baseline, you have your answer.
• Datacenter gets 200s full of challenge pages. A softer version of the same filter. The site lets hosting ranges in, then makes them prove they are human. ISP usually clears it.
• Datacenter starts clean, then 429s pile up. That is a rate limit, and the registration has little to do with it. Slow down, spread the load across more addresses, and read the 429 guide before paying for anything different.
• ISP fails too, while your own connection passes. The site is looking past the ASN. A static address of any kind will struggle, and rotating residential is the next thing to test.
• Everything fails, baseline included. The IP was never the problem. Headers, TLS fingerprint and request pacing are. The blocking checklist and the 403 guide cover those.

One caveat about the shared IP. It is shared with up to 3 customers, so a bad result can be a neighbour’s fault: someone else hammering the same site from the same address. If the shared result is borderline, repeat it on a dedicated IP before you conclude the whole line is blocked.

When should you pick ISP even if datacenter passes?

When the thing on the other end is an account you want to keep for months. A site that ignores the ASN on its public pages can still weigh it at sign-in, or start weighing it after an update you will not be told about. For logins, a consumer registration is cheap insurance, and at the list prices on this page it costs nothing extra.

The same goes for anything where a flag is expensive to undo: your own store’s admin, a monitoring login you have held for years. Give it its own dedicated ISP address and leave it there.

When is datacenter the better pick?

When it passed the test and the ASN will never matter: bulk crawls of sites that do not filter hosting ranges, and APIs or feeds you poll with a key. A hosting address is exactly what it says it is, and nothing about the job changes if the site looks it up.

Here, honestly, the case stops there. At the same list price on this page, and with every datacenter country also on the ISP list, ISP costs you nothing extra and covers a later change of mind. Datacenter is the pick when the ISP plan you want is out of stock, or when you would simply rather your traffic be labelled for what it is. The locations page has both country lists.

What neither of them does

Neither gives you thousands of addresses. One static IP making a lot of requests gets rate-limited sooner or later, whatever its registration. If the job is breadth rather than identity, rotating residential is the tool: a new home IP on each new connection, billed by the gigabyte at $5.50/GB for a single gigabyte and less in bulk, with no choice of country. The which proxy type flowchart sorts that out in four questions, and proxy pricing explained turns per-GB and per-IP prices into the same unit so you can compare them.

The short version: rent the cheap datacenter IP, run 50 pages, compare with your own connection. You will know in ten minutes which paperwork the site wants, and you will have spent less than the time it took to read the other articles about it.