16 bytes isn't always enough to store an IPv6 address. Depending on the requirements, you may need to store a fully scoped IPv6 address, such as fe80::1%eth0.

16 bytes isn't always enough to store an IPv6 address. Depending on the requirements, you may need to store a fully scoped IPv6 address, such as fe80::1%eth0. Edit to note: I store the fully scoped IPv6 address in a database as part of my CMDB mechanism.