RFC 1884: “IP Edition 6 Addressing Architecture” makes use of that phrase for some bits at the end of an IPv6 handle. (The amount of bits seemed to fluctuate in a few distinctive examples, but this identifier was ordinarily according to the MAC-forty eight deal with of a network card.) https://israelholdu.goabroadblog.com/25935323/facts-about-whatsmyipv4-revealed