How to Quickly Identify a Low-Quality Proxy

1. Ping Test
   Always start with a basic ping test. High ping (300ms+) usually indicates mobile or overloaded residential proxies. Solid ISP/residential proxies should ideally have < 100ms ping.
2. Check ASN and Hostname (IPinfo or ip-api)
   Run the proxy IP through IPinfo.io or ip-api.com. Good residential proxies show real residential ISPs. DC proxies usually show something like OVH, DigitalOcean, etc. If it claims residential but shows datacenter, walk away.
3. Blacklist Check (IPQualityScore)
   Quickly run the IP through IPQS. A proxy that's flagged here = guaranteed problems later.
4. WebRTC & DNS Leak Test
   Go to browserleaks.com/webrtc and dnsleaktest.com. Make sure your proxy isn't leaking real DNS or WebRTC info.
5. Manual Google Test
   Easiest trick: just google "my ip" or visit whoer.net. See what Google shows. Any weird mismatch or obvious proxy label = no-go.

seamlessproxies said:

A lot of proxies look clean on the surface but can ruin your projects.
Here's a quick method I personally use to check if a proxy’s worth the money:

1. Ping Test
   Always start with a basic ping test. High ping (300ms+) usually indicates mobile or overloaded residential proxies. Solid ISP/residential proxies should ideally have < 100ms ping.
2. Check ASN and Hostname (IPinfo or ip-api)
   Run the proxy IP through IPinfo.io or ip-api.com. Good residential proxies show real residential ISPs. DC proxies usually show something like OVH, DigitalOcean, etc. If it claims residential but shows datacenter, walk away.
3. Blacklist Check (IPQualityScore)
   Quickly run the IP through IPQS. A proxy that's flagged here = guaranteed problems later.
4. WebRTC & DNS Leak Test
   Go to browserleaks.com/webrtc and dnsleaktest.com. Make sure your proxy isn't leaking real DNS or WebRTC info.
5. Manual Google Test
   Easiest trick: just google "my ip" or visit whoer.net. See what Google shows. Any weird mismatch or obvious proxy label = no-go.

You can do these tests in literally 2 minutes.

Doing your homework here saves time, money, and avoids bans later.
If anyone wants tips on automating these tests or discussing advanced fingerprinting checks, drop a comment.

Cheers

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GlobalProxy4g said:

Solid checklist, IPQS in particular saves a lot of trouble later on. One thing we’ve noticed though: even if the proxy looks clean on ASN or DNS, it can still fail on more subtle fingerprinting layers, like TCP/IP handshake timing or behavioral request patterns.
Mobile proxies, when managed properly, tend to pass more naturally. Real modem routing with dynamic ASN behavior mimics organic sessions better, which makes them much harder to detect,especially on sensitive platforms.

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