RFC 1884: “IP Variation 6 Addressing Architecture” makes use of that phrase for a few bits at the conclusion of an IPv6 address. (The amount of bits appeared to vary in a few different illustrations, but this identifier was ordinarily based on the MAC-48 handle of a community card.) Persistently, https://franciscoraoal.wikilentillas.com/623119/how_much_you_need_to_expect_you_ll_pay_for_a_good_what_is_my_ip