Private IPv6

5 pts.
Private IP
Does IPv6 have private address such as IPv4's or Or is there a way to get an IPv6 address and roll back to a private IPv4 address on a Router?

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IPv6 now has something called ULA – Unique Local Addresses, described in RFC4193, which is not identical to RFC1918 IPv4 private addresses, but is very similar.

See this link for more information.

old answer:
There doesn’t appear to be a private IP range with IPv6.

This is what I found online.
<pre>IPv6 does not include private network features such as NAT. Because of the very large number of IPv6 addresses (the IPv6 address space is 128 bits compared to 32 bits for IPv4), IPv6 users should be able to obtain IPv6 address space for use at their discretion and without artificial barriers between their network and the Internet. However, there is an address range allocated for cases where users will not be able to get an officially assigned network, namely the fc00::/7 range as described in RFC 4193. Addresses from this range are called “Unique Unicast”, since each network contains a 40 bit random number to prevent collisions when two private networks are interconnected.

A former standard proposed the use of so-called “site-local” addresses in the fec0::/10 range, but due to major concerns about scalability and the extremely fuzzy definition of “site”, its use has been deprecated since September 2004 in RFC 3879.</pre>

You can read up more on Private Networks segmengs here.

Discuss This Question: 2  Replies

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  • SilviaHagen
    Hi The answer to your question is Yes, there are addresses which work like what we call private addresses in IPv4. They are called Unique local addresses in IPv6 and have a special prefix of FD00::/8. They can even be "inofficially" registered at, which should help to prevent from choosing an address space which is used already by someone else. The rules are the same like for private addresses. ULA's as they are called should never be routed to the Internet. It is important to make clear that this is a replacement for private addresses but NAT's is a concept that should not be used in an IPv6 network. So the idea behind the whole thing is that you could use ULAs for addressing all your internal systems, which means they are not reachable from the Internet per se. And then only assign public IPv6 addresses to interfaces of hosts that need access to the Internet. And only corporate service or application systems that need to be accessed from the Internet and are in the DMZ get a public IPv6 address. Cool stuff, isn't it? Hope this helps Silvia
    565 pointsBadges:
  • Sixball
    No love for the NAT.. But "translating" from your "private ip range" to a "public ip range" i,s in essence, NAT'ing...
    8,705 pointsBadges:

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