IANA Finally Out of IPv4 Addresses

Some people thought it would never happen, but APNIC has received the two triggering blocks in IPv4. With the assignment of these two blocks, the five remaining will be divided among each of the five regional registries. From the article:

Please be aware, this will be the final allocation made by IANA under the current framework and will trigger the final distribution of five /8 blocks, one to each RIR under the agreed “Global policy for the allocation of the remaining IPv4 address space“.

After these final allocations, each RIR will continue to make allocations according to their own established policies.

APNIC, the Asian/Pacific regional registrar, has plans to dole these out over the next five years. They’re also winding up with 3 /8 blocks (the two assigned, plus the one they get in the allocation agreement). The other registrars won’t have as many addresses to give, and so I’m certain that they won’t last so long.

Is it obvious yet?

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  • katre

    Scary. So, I have a small network (half a dozen servers, some user machines) that currently live on, internally,, and externally on a static IP from my ISP. My ISP will give me an IPv6 allocation (I’m not sure of the size).

    But I’m totally lost as to how to set it up. With a single static IPv4, I used a fairly simple firewall and NAT, and that kept things secure enough (with some magic to block people trying to brute-force my SSH daemon). Part of the appeal of IPv6 is getting rid of NAT, but I’m not sure I want my network directly exposed to the internet. Certainly not the user machines!

    Are there any good guides out there for setting up this type of small IPv6 network? Where should I start?

  • @katre

    Your ISP should give you a /48 (remember, IPv6 addresses are 128 bits total). Of that /48, your subnets will each be /64.

    Most of the difficulty in converting to IPv6 is, I think, the mindset. We’re used to having NAT “protect” us (even when it /really/ doesn’t, we just act like it does).

    I would highly recommend picking up the O’Reilly book IPv6 Essentials, which I bought as an ebook on my iphone.

    I haven’t implemented it yet (I’m still working on getting time to build a lab), but from everything I have read, it seems like the key parts are getting used to the prefixes. The beginning of an IPv6 address is the prefix, and determines what that address is used for (such as only communicating on the local network, or communicating with the internet, or providing an anycast service, or whatever. Each has its own prefix).

    Another old idea of ours that gets tossed out the window is the concept of having only one IP per interface. With each prefix leading to a different IP address, you wind up with a lot of IPs per physical interface.

    Start building a lab now, and playing with it. Once you get used to the idea of the addresses, check out Hurricane Electric’s free IPv6 Tunnel Broker. They’ll give you
    IPv6 connectivity over your IPv4 tunnel so that you have access to the IPv6 world.

    It’s never too early to start learning about this stuff. Good luck, and definitely let me know how you do!

  • katre

    Sounds interesting. I’ll definitely need to revisit my network topology but I doubt that’s a bad thing!

  • Normie

    There should be some addresses freed up when Nortel finally bites the dust – they own the 47.*.*.* address range. I assume that it wil get returned to IANA. Although I suppose it could be sold off as part of Nortels assets.

    Also, the UK Government and UK Defence both have a /8 address range each. Based on th UKs financial woes maybe they should sell those to help reduce the budget deficit. What would a /8 range be worth I wonder?

  • Disclaimer: vendor here …

    You’re getting into the capacity/performance territory where a scale-out NAS solution starts to make more sense. If not now, then before too long, given your capacity ramp.

    There’s only so far you can go by cobbling together individual NAS instances before you become entirely consumed with managing devices, file systems, etc.

    There are good scale-out NAS products from EMC, HP and IBM among others. I, of course, could make a passionate argument as to why I think ours (Isilon) is the best, but I’ll spare you the vendor blather.

    — Chuck