Why IPv6?
IPv4 addresses are scarce; many networks rely on NAT and shared addressing. IPv6 provides a much larger space and is designed for end-to-end addressability.
On servers, IPv6 can simplify planning for workloads that need many addresses — for example proxy fleets, hosting panels or service separation.
Subnets and prefixes
An IPv6 address combines a network prefix and an interface identifier. Prefix length (for example /64 or /48) defines how much of the block is used for routing and further subdivision.
- /64: a common default for many LANs and single segments
- Wider prefixes (for example /48): can be split into multiple /64s
- The block size assigned to you depends on the provider plan and network
Dual-stack (IPv4 + IPv6)
Most production environments still serve IPv4 clients. Dual-stack means the same service is reachable on both families. DNS A and AAAA records are configured accordingly.
Practical notes
Define firewall rules for IPv6 as well — locking only IPv4 is not enough. Clarify routing, reverse DNS and acceptable-use policy with your provider. This article is educational; verify topology with your team.
