Assess quality of proxy

Real-world testing is still the best check, but for initial filtering I usually look at ASN type, IP reputation, DNS consistency and whether the IP matches the claimed geo/provider. Tools can help, but they’re never perfect. A clean-looking IP can still perform badly depending on the target. For static residential, provider quality matters a lot since you keep the same IP long term.
 
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Curious if anyone has found anything around JA3 and JA4 detection as a signal etc. Almost no proxy detect site or fingerprinting site is really surfacing that. it's newer more sophisticated. I did come across one site that was showing it but I'll have to find it again.
 
Normally, people will use more than one technique instead of focusing on a single metric because a proxy label might not be an accurate way to determine whether someone is a bot or not. The first thing that comes to mind for most people would be using Iphey as a quick identifier along with an ASN sanity check, followed by cross-reference from another tool such as MaxMind or Ipinfo. However, the true litmus test will ultimately be the behavior on the target platform.
 
Papa Mexicana said:
Normally, people will use more than one technique instead of focusing on a single metric because a proxy label might not be an accurate way to determine whether someone is a bot or not. The first thing that comes to mind for most people would be using Iphey as a quick identifier along with an ASN sanity check, followed by cross-reference from another tool such as MaxMind or Ipinfo. However, the true litmus test will ultimately be the behavior on the target platform.
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ASN, DNS, timezone, WebRTC, browser stack all need to make sense together.
 
Frauddefense I tried the first time. it's much better than the others.
 
Good points especially about ASN/IP reputation and geo consistency. I’ve also noticed even “clean” IPs can still get flagged depending on the platform, so testing ends up being the real decider.
 
For a quick sniff test, i usually just run a traceroute and check against public asn databases. if it doesn't line up, it's a hard pass. honestly, for the real work, it's all about testing against the actual sites you need. anything else is just guess-work
 
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