How to Detect Proxy / VPN IPs: Methods and Risk Flags
How Proxies and VPNs Work
Both proxies and VPNs route your traffic through a relay server, so the destination sees the relay's IP instead of your real one.
Why Detection Matters
- Risk control and anti-fraud: spotting fake orders and mass registrations.
- Content policy: regional restrictions rely on egress IPs.
- Security: proxy nodes are often used for scanning and brute force.
Detection Signals
- ASN and datacenter traits: many proxy/VPN providers use datacenter IPs with IDC or cloud ASNs.
- IP database labels: offline databases flag datacenter, public DNS, and suspected proxy/VPN.
- Behavior: high request volume, geographic jumps, and fingerprint anomalies.
- Port/protocol probing: some proxy services expose fixed ports.
This Site's Proxy/VPN Flag
Using organization keywords and ASN lists of common overseas hosting/VPN providers, this site labels results as "suspected proxy/VPN" for reference only.