How often should I run a leak test?

After installing a VPN, after major app or system updates, and whenever you change devices or routers.

Is a DNS leak dangerous?

It exposes every domain you visit to your internet provider or whoever runs the network, which defeats one of the main reasons to use a VPN.

Does incognito mode prevent WebRTC leaks?

No. Incognito mode does not change how WebRTC handles IP addresses.

How to Test Your VPN for IP, DNS and WebRTC Leaks in Five Minutes

Before you start

With the VPN off, open an IP-check site such as ipleak.net or browserleaks.com and note your real IP address and your internet provider’s name. That is what must not appear in any of the tests below.

1. IP address

Turn the VPN on and reload the IP-check page. You should see the VPN server’s IP and location, not yours. If your real IP still appears, the tunnel is not carrying your traffic.

2. DNS leak

Run the extended DNS test on dnsleaktest.com or ipleak.net. The DNS servers listed should belong to your VPN, not to your internet provider. A DNS leak means your provider still sees every domain you visit — the problem described in what your provider can see. VPNZONE runs its own resolver on every server to prevent exactly this.

3. WebRTC leak

WebRTC is a browser feature for video calls that can reveal IP addresses to websites. Open the WebRTC page on browserleaks.com: your real public IP should not appear. If it does, your VPN’s leak protection or a browser setting needs attention.

4. IPv6 leak

Many VPNs only tunnel IPv4. If your provider gives you IPv6, websites may see your real IPv6 address. The test sites above show an IPv6 line — it should be empty or belong to the VPN.

5. Kill switch

Enable the kill switch in your VPN app.
Start a continuous action — a video or a large download.
Force a drop: switch from Wi-Fi to mobile data, or briefly disconnect the Wi-Fi.
Watch the IP-check page. A working kill switch blocks traffic until the tunnel is back; your real IP should never appear.

If a test fails

Update the VPN app and reconnect.
Make sure leak protection and the kill switch are enabled in its settings.
Turn off any other VPN, proxy or “private DNS” setting that could compete with it.
If it still leaks, switch providers — a leaking VPN is worse than none, because it makes you feel safe when you are not.

VPNZONE includes a kill switch and DNS, IPv6 and WebRTC leak protection on every plan, the free one too.

VPNZONE pricing: $3 a month or $24 a year, or $99 once for a lifetime seat (first 1,000 members). Every plan includes unlimited data, speed and devices, every location, Threat Protection and a 30-day money-back guarantee. On Android you can try it free for 7 days, and the free plan gives you 300 MB every day with no account.