![]() I have no idea why you would do this but you can check it out at SixXS's site. There have been a few interesting efforts to coordinate ULA prefix allocations. ![]() That means the only valid ULA addresses to use today are from the fd00::/8 prefix. The local flag value of 1 indicates that the prefix is locally assigned. The local flag value of 0 hasn't been defined and therefore should not be used at all which eliminates the fc00:/8 prefix from being used. This means the prefix is divided into fc00::/8 and fd00::/8. This means the prefix has a fixed binary value of 1111 110 x with ULA having the concept of a local flag bit ( x) which is the 8th bit. ULA is a unicast address type and is limited to the fc00::/7 prefix. ![]() I thought I would share some brief information about ULA and follow up with my thoughts about it. The subject of IPv6 Unique Local Address or ULA (which is one of the unicast IPv6 address types) seems to be getting more attention now that IT professionals are actually looking at how to deploy IPv6. Some are worthy of a blog post or two so here it is. I am often asked interesting questions by fellow IT professionals about IPv6.
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