Why Do IP Detection Sites Disagree About the Same Proxy?

If you have ever bought a proxy, run it through two or three checker sites, and gotten three different verdicts, you are not alone — this is the single most common support question we get. One tool says the IP is a clean ISP line. Another flags it as "hosting". A third shows a fraud score of 0 while a fourth shows 35.

Here is the uncomfortable truth: none of them are wrong. They are answering different questions.

Three different questions, three different answers

Every IP intelligence provider builds its verdict from its own database and its own rules. Broadly, they look at three things:

1. Who is the IP registered to? Every IP range is registered in public records under an organization. If the range belongs to a consumer carrier, many checkers will classify it as ISP or residential.

2. Where is the IP actually hosted? Some providers map the network infrastructure behind an IP. If the machine answering on that IP lives in a datacenter, these checkers will say "hosting" or "datacenter" — even when the registration says carrier.

3. What has this IP done recently? Reputation providers (Scamalytics, IPQS, IPData and others) score each IP by its observed history: spam, abuse reports, proxy detections, bot traffic. This is the "fraud score" or "risk score", and it changes over time.

A static ISP proxy sits exactly at the intersection where these three questions give different answers — and that is by design.

What a static ISP proxy actually is

A static ISP proxy is a fixed IP whose address range is registered to a real internet carrier, while the server behind it runs on datacenter infrastructure. That combination is the whole point:

• You get the stability of a server — always on, fast, fixed for your whole billing period
• With the identity of a carrier line — registered to a real ISP, not a cloud provider

It is much cleaner than a typical datacenter IP, but it is not someone's home broadband. So a checker that keys on registration says "ISP". A checker that keys on hosting says "datacenter". Both are reading the same IP correctly, through different lenses.

This applies to every static ISP proxy on the market, from every provider. If a vendor tells you their static ISP IPs will show as residential on every detection site, they are describing something that does not exist.

What a fraud score of 0 actually means

A fraud score is one provider's opinion, built from that provider's own data. Three things follow from this:

1. Scores are per-provider. The same IP can score 0 at Scamalytics and 40 at IPQS, because they observe different signals and weight them differently.
2. Scores drift. A score reflects the IP's recent history. An IP that scores 0 today can pick up points later — or shed them.
3. A guarantee is only meaningful per-provider. When a proxy service offers "0 fraud score" matching, the honest version of that promise is: *score 0 with the specific provider you chose, at assignment time.* Anything broader is marketing.

How to buy without surprises

Before buying any static ISP proxy — ours or anyone's — answer one question first: which checker does your workflow actually care about?

• If a target site or tool you rely on reads a specific reputation provider, match against that one. Search1API lets you pick the provider (Scamalytics, IPQS, IPData, or IP2Location) and assigns an IP that currently scores 0 there.
• If what matters is the usage-type classification — being labeled an ISP line rather than a datacenter — that is a different dimension from fraud score. Our Premium tier ships only IPs whose IP2Location usage type is ISP, because IP2Location is the database many sites read for exactly this field.
• If you just need a stable, carrier-registered IP and have no specific checker requirement, the standard tiers are fine — and cheaper.

And one thing no proxy can promise: that a target website will never ban you. Risk systems look at account history, device fingerprints, and behavior patterns as well as the IP. A stable ISP IP removes one common trigger; it cannot remove all of them.

A 30-second checklist

1. Know which detection site (if any) your workflow depends on.
2. Buy the guarantee that matches it: per-provider 0-score matching, or IP2Location-verified ISP type.
3. Expect other checkers to disagree — that is normal, not a defect.
4. Re-check scores over time; they drift. A good provider will re-match you if your guaranteed provider's score moves.
5. Treat "clean on every checker" claims as a red flag, from any vendor.

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Search1API static ISP proxies start at $1.99/month, with optional 0-fraud-score matching against the provider you choose and an IP2Location-verified Premium tier. See plans and live availability →