The same proxy address passes checks on one platform and gets blocked outright on another — that is not a bad batch of IPs, it is a difference in how each site's defenses are built. Every platform runs its own set of filters, and what is enough for one site is only the first hurdle for another. Here is what makes up that difference, and what to do instead of endlessly swapping addresses.
Every platform runs its own set of filters
Site defenses are not a single check but a stack of independent layers: IP country and city, the autonomous system (ASN) the address belongs to, the address's accumulated reputation, whether the time zone and interface language match, and session behavior after login. Each platform decides how many layers to turn on and how strictly to apply them. A simple regional blog looks at country alone. A large service handling accounts and money turns on the whole stack at once.
One checks geo only, another checks everything
The most basic check is IP geolocation — country and sometimes city. Almost any proxy of the right geography passes it, datacenter included. The next level is an ASN check: the system looks at who owns the address, and a datacenter IP is spotted immediately on a site with that filter, even if geolocation shows the right country. Stricter still are platforms that cross-reference the IP against account history: if logins have always come from one region and today's address is physically somewhere else, that triggers extra scrutiny regardless of how "clean" the address is. How systems read an address's origin is covered in what an ASN is and why it matters.
IP reputation is accumulated history, not a current status
An address from a shared pool is not issued to you alone — dozens of other clients may have used it before you, and some of them likely broke a given site's rules. Every such incident leaves a trace in reputation databases: the more complaints, automatic bans and matches with known abuse patterns pile up on an address, the higher its fraud score. A formally fresh, geographically accurate IP can already be tainted by previous users — the site is not reacting to your actions but to the address's combined history. How that metric is calculated and lowered is explained in IP fraud score: what it is and how to lower it.
Why payment services are stricter than marketplaces
A marketplace mainly needs correct localization: the right currency, available delivery options, local pricing. A mistake there costs one unhappy buyer. An instant payment system's mistake costs real money — a stolen card, a laundered transfer, a bypassed fraud limit. That is why payment and banking services add layers a storefront does not have: geo-velocity checks (you cannot physically be in another country ten minutes after your last login), behavioral biometrics, device-to-account binding. An address that is good enough to buy something on a marketplace gets rejected by a payment service precisely because its risk threshold is lower.
What to do instead of cycling through addresses
Swapping IPs at random is the most expensive fix: you burn traffic or session allowance without knowing which filter triggered. Gauge the platform's strictness first. Check the address's ASN and fraud score before you start, not after a ban — that filters out bad addresses from the outset. Match the channel type to the task: residential or mobile is closer to a real subscriber and clears more filters than datacenter; why mobile IPs are especially hard to block without collateral damage is covered in mobile versus residential proxies. Keep the environment consistent — time zone, browser language and IP geography should all agree — and let request frequency look like a real user rather than a script. If an address has already been blocked by a specific site, a separate walkthrough of what to do is in what to do if the assigned IP is already banned by the target site.
Frequently Asked Questions
Does a block on one site mean the IP is "bad" everywhere?
No. Each platform applies its own combination of filters, and a rejection on one does not imply a problem on another: the address may have failed an ASN check or a behavioral check that the other site does not even run.
How can I tell which filter actually triggered?
Sites do not disclose the reason for a ban directly, but you can rule things out in order: check the address's geolocation and ASN with independent services first, then its fraud score, then whether the time zone and language match the expected geography. The problem is usually found in one of the first two steps.
Can I check an IP's reputation before I start using it?
Yes, fraud-score checking services show an address's reputation upfront, without contacting the target site. That is especially useful for a dedicated address: you build its history from zero and control who uses it and how.
The catalogue of residential, mobile and datacenter addresses with current prices is in the proxy section. It also shows which channel type fits the strictness level you are dealing with.