LOOKIP.IO
Proxy Detection · Free

Detect Open & Residential
Proxies on Any IP.

Lookip flags HTTP / SOCKS open proxies, datacenter proxies, and residential proxies — including the named service when we can attribute it. 50 free lookups per day.

  • 50 Free Lookups / Day
  • +100 With a Free Account
  • IPv4 + IPv6
VPN Proxy / Tor Geolocation
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Open vs Residential

Open proxies (publicly advertised HTTP/SOCKS endpoints) are the easy case. Residential proxies — IPs sold as “real users” — are where the dataset earns its keep.

Hosting + Anycast

Beyond proxies, we surface hosting and anycast flags. Use them to bucket datacenter traffic separately from real consumer eyeballs.

Confidence Signals

When available, the response includes a confidence level (1-3) and the share of recent days the IP behaved like a proxy.

FAQ

How do you decide an IP is a residential proxy?
We combine direct proxy-config captures, census scan results, passive device-activity evidence and WHOIS corroboration. No single signal is enough on its own.
Can I batch a list of IPs?
Yes — sign up and use the REST API. The `/v1/batch` endpoint accepts up to 100 IPs per call.
What about CGNAT and mobile carriers?
They’re flagged separately under `isMobile` / `isCarrier`. Don’t treat them as proxies — they’re real users behind shared carrier-grade NAT.

Need This in Your Stack?

The same data ships behind a clean REST API with a free tier. Bearer auth, batch endpoint, IPv4 + IPv6.