Question 1

What does this actually check?

Accepted Answer

Five things at once: the IP your traffic exits from, the purity grade we hold for it, whether the owning network is a consumer ISP or a hosting company, whether your browser timezone and language line up with the location of the IP, and whether WebRTC reports a different address than your HTTP traffic.

Question 2

Why does a timezone mismatch matter?

Accepted Answer

Because it is cheap to check and hard to fake by accident. If the IP maps to Frankfurt and the browser reports Asia/Shanghai, the connection is routed through something. Fraud rules act on that pairing all the time.

Question 3

What is a WebRTC leak?

Accepted Answer

WebRTC can discover your address through a STUN server, separately from your HTTP connection. If a proxy only covers HTTP, the two answers differ and the site learns where you really are.

Question 4

Does running the check use up my free lookups?

Accepted Answer

Yes, one per run, which is why nothing runs until you click. The check uses the same allowance as the bulk proxy checker.

Question 5

My connection graded C. Now what?

Accepted Answer

The IP is already on public anonymiser lists. Switch to a different exit and check again. Checking a whole batch at once is faster than going one at a time.

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