Are you using IPv6?
This checks which protocol your connection used to reach this page.
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What this result means
When your browser loads a page, it picks one protocol for the connection. If your network offers both, it usually prefers IPv6. The result above is the protocol it picked this time.
An IPv6 result means your network supports IPv6. An IPv4 result often means IPv6 isn't available to you, but it isn't proof: this page doesn't yet run separate IPv4-only and IPv6-only checks.
Why IPv6 matters
The world has run out of new IPv4 addresses. IPv6 replaces the 32-bit address space with a 128-bit one, which is enough for every device without the workarounds, like carrier-grade NAT, that providers use to share scarce IPv4 addresses. Those workarounds are a common cause of strict NAT types in games and failed incoming connections.
IPv6 is switched on by your internet provider, not your device. Most modern phones, computers and routers already support it. If you're on IPv4, check your provider's support pages, or look for an IPv6 option in your router's WAN settings.