Called a scope ID”. It provides an example where by a “zone ID” during the fe80::/64 variety “may be the interface index from the interface hooked up on the connection that contains the destination address”, but another instance with the fec0::/48 variety wherever the “zone ID” “is the website ID https://charlieqaipv.designi1.com/48167747/a-review-of-whats-my-ipv4