RFC 1884: “IP Variation 6 Addressing Architecture” makes use of that phrase for a few bits at the conclusion of an IPv6 deal with. (The quantity of bits appeared to range in certain diverse illustrations, but this identifier was commonly based upon the MAC-forty eight handle of the community card.) https://what-is-my-ip65207.dailyhitblog.com/31563919/the-definitive-guide-to-whats-my-ipv4