How websites detect a VPN
There is no single flag that says "this visitor uses a VPN". Websites infer it from several clues, and so does this tool. Streaming services, banks and online shops use similar checks, which is why a VPN can sometimes get you blocked or asked for extra verification.
The signals we check
- Network name and number. Home connections belong to consumer ISPs. VPNs and proxies run on data-centre networks owned by hosting companies. We compare the network name against known VPN, proxy and hosting keywords.
- Known hosting networks. A short, curated list of network numbers (ASNs) that commonly carry VPN traffic.
- Time zone mismatch. Your browser reports your device's time zone. If your IP points to a different one, the connection may be routed elsewhere.
- WebRTC. If WebRTC reveals a public address different from the one the site sees, a tunnel or proxy is probably involved (and leaking).
Each signal has a weight. A hosting-network match is strong; a time zone mismatch alone is only a hint, because travellers and people who set their clocks manually trigger it too.
What the verdict means
| Verdict | Meaning |
|---|---|
| Probably a VPN, proxy or hosted network | Strong evidence. Sites will likely see you the same way. |
| A VPN or proxy is possible | Weaker evidence, such as a time zone mismatch. |
| No VPN or proxy detected | You look like an ordinary connection. If you are on a VPN, it is a residential-style or well-hidden one. |
Why sites care
Streaming services must honour regional licences, so they block known VPN ranges. Shops and banks treat a sudden change in apparent location as a fraud signal. Forums and games ban users who evade bans by switching addresses. Even sites with no rule at all may serve you extra CAPTCHAs because data-centre traffic is more often automated. The same detection that annoys you is part of why a VPN address is shared with many other people, which is a modest privacy benefit.
If you expected a different answer
You use a VPN but see "not detected". Your VPN may be routed through residential IP addresses, or may not be active in this browser. Check the IP shown on the home page against your VPN app.
You do not use a VPN but see "likely". Corporate networks, universities, cloud desktops and some mobile carriers share addresses that look like hosting. Satellite and CGNAT providers can too.
Detection lists age quickly and no public list is perfect, so treat this as a good estimate and not a guarantee. Learn more in our guide to hiding your IP and VPN vs proxy vs Tor.
Last reviewed 2026-10-26. Found a mistake? Report a correction (how we handle them).