Proxy Checker
Detect a Proxy from an IP
Enter an IP to check whether it is a proxy, what type it is, and how confident the verdict is, then automate the same check through the API.
How to detect a proxy from an IP address
To detect a proxy from an IP you check whether the address is relaying traffic on behalf of someone else. That means testing for open proxy endpoints, matching against residential and datacenter proxy pools, correlating with the Tor exit list, and inspecting forwarding headers and timing. The proxy checker above runs these checks instantly and returns the proxy type and a confidence score.
What the proxy check looks at
Proxies leave several traces, the verdict weighs all of them.
Open proxy endpoints
Exposed HTTP/HTTPS and SOCKS proxy services on the IP.
Pool membership
Presence in residential or datacenter proxy provider pools.
Tor correlation
Match against the live Tor exit-node list.
Forwarding headers
Headers that reveal relayed or chained requests.
ASN context
Hosting vs. residential ownership of the range.
Type & score
A clear proxy type label plus a 0–100 confidence value.
Where this helps
Forms & checkout
Add friction when a request comes through a proxy.
Comment & review spam
Block proxied spam at the source.
Geo enforcement
Stop proxy-based circumvention of regional rules.
Security investigation
Quickly triage a suspicious IP during an incident.
Explore related detection tools
Try Our Other Tools
Frequently asked questions
Why Choose IPScanner
Teams use IPScanner to tell real users apart from masked and automated traffic.
Accuracy you can measure
Verdicts come with a 0 to 100 confidence score, so you tune the threshold to your own risk instead of trusting one number.
Built to scale
The API runs on infrastructure sized for production traffic, with a 99.99% uptime target for business-critical use.
Data that stays fresh
We refresh VPN, proxy, and Tor lists continuously, so newly spun-up servers get caught quickly.
Easy to wire in
A plain REST API works with any language or framework. Most teams are live the same afternoon.
Documentation that's honest
Worked examples in curl, JavaScript, and Python, plus straight notes on what each signal does and doesn't mean.
People who know the domain
Support comes from engineers who work on IP detection every day, not a generic help desk.
