- https://github.com/ygvn/IPv6-Subnet-Calculator-Tool-JavaFX - https://github.com/beardedlinuxgeek/ipv6-subnet-calculator - https://github.com/aipi/IPv6-subnet-calculator There are several implementations to reference; and its possible code from the first example may be [license-compatible](https://www.gnu.org/licenses/license-list.en.html#ModifiedBSD).