IPv6 Dual-Stack Test
Test IPv4 and IPv6 protocols simultaneously. Check dual-stack reachability, compare latency between address families, and detect protocol routing issues.
Best solution
Network diagnostic: IPv6 Dual-Stack Test; IPv4 vs IPv6 Latency Comparison.
Start a lookup to see the address visible to ipify.
A VPN, proxy or relay can change the observed address. HTTPS request time is not ICMP ping, packet loss or internet speed.
Clicking Check contacts ipify, which sees the request address. Results stay in this page. No automatic polling.
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Methodology & calculation rule
Dispatches parallel asynchronous HTTP requests to isolated IPv4-only and IPv6-only endpoints, evaluating dual-stack parity.
Network observations execute bounded requests to public measurement backends (ipify, Google Public DNS, Globalping, or Cloudflare). Measurements distinguish local client configuration from external internet reachability.
No browsing history, private tokens, or credentials are captured. Results are snapshots of external probe vantage points at the recorded observation timestamp.
Real-World Context & Technical Standards
Concurrent IPv4 and IPv6 Coexistence
Dual-stack network configurations provide parallel IPv4 and IPv6 routing tables, allowing devices to communicate seamlessly with legacy IPv4 services while prioritizing native IPv6 routes.
Happy Eyeballs v2 Connection Racing
Modern browsers initiate simultaneous parallel connection attempts over IPv6 and IPv4, selecting whichever protocol establishes a completed TCP/TLS handshake first (typically with a 50 ms head-start for IPv6).
Independent Endpoint Probing
Testing IPv4-only and IPv6-only endpoints independently isolates whether protocol failures originate from ISP routing, router tunnel encapsulation, or local operating system adapter misconfiguration.
Related network diagnostic tools
| Tool | Metric | Scope |
|---|---|---|
| What Is My IP Address? | Diagnostic | what is my ip address |
| IP Address Lookup | Diagnostic | ip address lookup |
| Remote Ping Test | Diagnostic | ping test |
| DNS Lookup | Diagnostic | dns lookup |
| Is It Down? | Diagnostic | is it down |
Frequently Asked Questions
What is dual-stack networking?
Dual-stack allows a network interface and operating system to run IPv4 and IPv6 concurrently, routing traffic over IPv6 when available and falling back to IPv4 automatically (Happy Eyeballs, RFC 8305).
Is IPv6 inherently faster than IPv4?
IPv6 eliminates Carrier-Grade NAT translation delays and simplifies router packet header processing, but overall latency depends primarily on physical peering and transit fiber routing.