48 bit mac address ipv6 convert2/19/2024 The IETF significance of the EUI-64 U/L bit is backwards from the EUI-48 significance. Otherwise 0, which allows static locally assigned addreses such as 2001:db8::53 to be written conveniently. The general idea seems to be that if the host part is based on either a raw IEEE EUI-64 identifier or a mapped EUI-48 identifier (think ethernet MAC), it should be globally unique, so the IETF U/L bit is set to 1. In a better world, perhaps :-( The footnote to appendix A in RFC 4291 indicates that even the standards writers can't get it right.
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