DNS Leak Test vs IP Leak Test: What's the Difference?
Your VPN says "connected" and shows a green light. Is your privacy actually protected? Two different leak tests answer this—and they test different things.
The Quick Difference
- IP leak test: Checks if your real IP address is visible
- DNS leak test: Checks if your DNS requests bypass the VPN tunnel
Both can expose your identity and location. Here's why they're different.
What Is an IP Leak?
An IP leak occurs when your true public IP address escapes through the VPN tunnel. Websites and services see your real IP, not the VPN's.
How IP Leaks Happen
- IPv6 leaks: Your VPN may only tunnel IPv4 while IPv6 traffic goes direct
- WebRTC leaks: Browsers expose IP via WebRTC APIs
- Kill switch failure: VPN disconnects briefly but connection stays up
- DNS-based leaks: DNS queries reveal IP indirectly
How to Test for IP Leaks
Connect to VPN, then visit checkmyip.pro. If you see your real IP or location, you have an IP leak.
What Is a DNS Leak?
A DNS leak happens when your DNS queries go to your ISP's DNS servers instead of the VPN's encrypted tunnel. Your ISP can see every site you visit.
How DNS Leaks Happen
- OS-level DNS settings: Windows/macOS sometimes bypass VPN DNS
- Router DNS override: Router forces ISP DNS on all connections
- VPN misconfiguration: VPN doesn't force its own DNS servers
- Split-tunneling issues: Some apps bypass VPN DNS
How to Test for DNS Leaks
Use a dedicated DNS leak test tool. Most will show which DNS servers responded. If they're your ISP's servers, you have a DNS leak.
Why Both Tests Matter
| Test | What It Reveals | Privacy Risk |
|---|---|---|
| IP Leak Test | Your real IP address | Location, ISP identity, tracking |
| DNS Leak Test | Browsing history, sites visited | Full activity log, censorship evasion |
Combined Threat Example
Scenario: You have an IP leak but no DNS leak. Websites see your real IP but can't match it to browsing history. You have location exposure but not full activity logs.
How to Fix Leaks
For IP Leaks
- Enable IPv6 blocking in VPN settings
- Use browser extensions to disable WebRTC
- Enable VPN kill switch
- Use a VPN that passes IP leak tests
For DNS Leaks
- Force VPN's DNS servers in settings
- Set custom DNS like Cloudflare (1.1.1.1) or Google (8.8.8.8)
- Check router DNS settings
- Use VPNs with DNS leak protection (most premium VPNs)
Which Is More Important?
For anonymity: IP leaks matter more—they reveal your actual identity.
For privacy from ISP: DNS leaks matter more—they show everything you do online.
Best practice: Test both regularly. Your VPN should protect against both.
Recommended Tools
- checkmyip.pro – IP leak detection
- DNSLeakTest.com – DNS leak testing
- BrowserLeaks.com – WebRTC and other leak tests
VPNs That Handle Both Well
ExpressVPN and NordVPN have built-in protection against both IP and DNS leaks with automatic kill switches and forced DNS.
Takeaway: Don't assume "VPN on" means "private." Test both leaks separately—they expose different privacy gaps.