Every internet-connected device requires an IP address, but the limited number of IPv4 addresses is insufficient for the growing number of devices, prompting the adoption of IPv6, which offers a vastly larger address space. Couchbase Server 5.5 introduces IPv6 support to address this issue, requiring users to configure each node in a cluster for IPv6 operation, with specific steps for Linux platforms. Transitioning from IPv4 to IPv6 in Couchbase can be complex, and the recommended approach for users is to establish a new cluster with IPv6 and use Cross Datacenter Replication (XDCR) to migrate data, as IPv4 and IPv6 clusters cannot pair for bi-directional replication. Users are encouraged to try the IPv6 feature in Couchbase Server 5.5's developer build, which is meant for non-production environments and may contain bugs.