20 Jun
2026
20 Jun
'26
2:21 p.m.
On Fri, Jun 19, 2026, 16:48 Gary Sparkes via NANOG <nanog@lists.nanog.org> wrote:
ULA is the equivalent of RFC1918, effectively. FC00::/7
You’re thinking of link-local addresses which are the fe80 addresses. Those are autogenerated. ULA is assigned however you want – SLAAC, DHCPv6, static, etc…. RFC1918 equivalent.
Nominally, you’d almost never think about link-local.
You essentially have all of fc00::/7 to utilize as you wish. (SNIP)
I didn't see it mentioned yet but I'm skimming- but this should be fd00::/8. The first /8 in fc00::/7 is reserved (ref. RFC 4193 § 3.1, 3.2, "L" bit).