IPv6 is 128-bit addresses in hexadecimal. Key types: Link-local (FE80::/10 — auto-configured, non-routable), Global unicast (public internet), Loopback (::1), Multicast (FF00::/8).
IPv6 has no broadcast — uses multicast instead. Link-local addresses are automatically configured on every IPv6 interface. IPv6 SLAAC (Stateless Address AutoConfiguration) enables auto-configuration without DHCP. Dual-stack = IPv4 and IPv6 simultaneously.