Instantly check whether your connection supports IPv6. See your address, type, /64 prefix and ISP details.
Detecting your connection...
Your IPv6 address is the one websites see when your device reaches them over IPv6. This page reads it from your own connection, and it also loads two addresses that answer only over IPv6 (ipv6.google.com from Google and ipv6.icanhazip.com): when those load, IPv6 works end to end, even if your browser reached this page over IPv4.
A different IPv6 address every day is normal: most systems use temporary privacy addresses (RFC 8981) for outgoing connections and replace them regularly, while the /64 prefix stays as long as your provider keeps it. No IPv6 address at all means that your provider, your router or your device does not have IPv6 turned on; IPv4 sites still work, sites that are reachable only over IPv6 do not.
IPv6 is the successor to IPv4, using 128-bit addresses instead of 32-bit. While IPv4 has roughly 4.3 billion addresses, IPv6 provides 340 undecillion - enough for every device to have a unique public address without NAT. Most major ISPs now support dual-stack (IPv4 + IPv6) connections. This test shows your current IPv6 address if you have one.
The test runs automatically when the page loads. If your browser connected via IPv6, your address is shown along with its type and /64 prefix. If you have no IPv6 connectivity, the page reports IPv4-only. No input is required.
Address types: Global Unicast (GUA, 2000::/3) is standard public IPv6. Teredo (2001::/32) and 6to4 (2002::/16) are transition tunnels that carry IPv6 over IPv4 - functional but slower than native. ULA (fc00::/7) addresses are private and not routable on the internet. The /64 prefix is your network segment - ISPs typically assign a /48 or /56 prefix per customer, from which individual /64 subnets are derived. To check whether your ISP supports IPv6, contact them or check their network status page.
Sent to our server: Your IP address (read from your connection). Your browser also contacts ipv6.google.com and ipv6.icanhazip.com directly. To stop abuse, we have to keep a count of your checks for up to 90 minutes; then it is deleted.