A much larger address space
IPv6 uses 128-bit addresses written as hexadecimal groups. A value such as 2001:db8:1234::10 can use a double colon to compress one sequence of zero groups.
The address space is vastly larger than IPv4, allowing networks to allocate structured address ranges without relying on widespread address sharing.
How IPv6 reaches the internet
IPv6 packets are routed directly between IPv6-capable networks. Firewalls still control unsolicited inbound traffic, so globally routable addressing does not mean every device should be reachable.
DNS uses AAAA records to publish IPv6 destinations. A client with working IPv6 can select that route while retaining IPv4 support through dual stack.
Transition and compatibility
IPv4 and IPv6 are separate protocols. Dual stack, translation, and tunneling mechanisms allow gradual migration while older networks remain online.
A public IP checker reports the version used for that particular request. The same device can show IPv4 on one service and IPv6 on another.
Privacy and security
IPv6 is not automatically anonymous or insecure. Modern operating systems can use temporary interface identifiers, while privacy still depends on storage, cookies, account data, and network policy.