IPv6 Connectivity Checker
Test whether a domain or website actually works over IPv6 with real TCP, HTTPS, and dual-stack comparison.
Tested directly over IPv6 from PacketFlo servers across DNS AAAA, TCP, and HTTPS/HTTP.
Enter a hostname to test IPv6 connectivity
DNS AAAA discovery, TCP handshake, HTTPS negotiation, latency, and IPv4 comparison appear here.
The IPv6 Connectivity Checker tests whether a domain or website URL is actually reachable and functional over IPv6 from PacketFlo's server infrastructure, not just whether an AAAA DNS record exists.
A domain may advertise an AAAA record in DNS, yet fail completely when clients attempt to connect due to broken IPv6 routing, firewall drops, missing server listener bindings, or asymmetric routing issues.
Each check evaluates DNS AAAA records, attempts raw TCP connections to target ports (such as 443 for HTTPS or 80 for HTTP), performs real application-layer HTTP/HTTPS requests with TLS negotiation, and compares performance against IPv4 to verify true dual-stack operation.
Frequently asked questions
Why can a website have an AAAA record but fail over IPv6?
An AAAA record in DNS is only a directory entry pointing to an IPv6 address. If the web server is not listening on that IPv6 address, if firewall rules block IPv6 traffic, or if upstream routing is misconfigured, connections over IPv6 will time out or be refused.
What does 'IPv4 works, IPv6 fails' mean?
It means the target responds normally when reached over IPv4, but fails when contacted over IPv6. Visitors with IPv6-enabled connections or mobile networks may experience slow timeouts or connection failures when trying to access the site.
Does an ICMP ping failure mean IPv6 is broken?
No. Many network firewalls block ICMP echo packets while allowing TCP and HTTPS traffic. If HTTP/HTTPS succeeds over IPv6, the service is working even if ping does not reply.