Reply to post: Re: Nope, never saw this coming

We are absolutely, definitively, completely and utterly out of IPv4 addresses, warns RIPE

bombastic bob Silver badge

Re: Nope, never saw this coming

was thinking later.. I suppose if IPv6 blocks were /96 instead of /64 then you'd be mapping a /96 but whatever. So many IPv6's are already being generated from the subnet using MAC addresses, in addition to any others you might get automatically assigned [my windows box typically gets 4 of them, 2 private, 1 'temporary', and one actually issued by dhcpv6] that exist within a /64 subnet. Anyway, same basic idea...

I suppose issuing /96 should be the norm? That gives you 32 bits (4 bytes of the MAC) instead of 48, Or you could issue /80 to get 48 bits for the MAC. I think there's already a mechanism in place for automatic addressing to use the lower 32-bits of the MAC on a /96 (or a subnet even smaller than that).

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