The end of the more than 30 years of IPv4

In more than three decade the IPv4 provided us the way to communicate between different devices (nodes, hosts, …). IPv6, the successor has been around for almost a decade and no one could hesitate that very soon no more IPv4 addresses will be available. During November five IPv4 /8 have been allocated to the different (RIR, Regional Internet Registrars) and only Seven IPv4/8 blocks are available.

What will happen next?
When two more blocks are allocated then the five remaining blocks will be automatically allocated to the five RIR:s and that would be the end of IPv4 address allocation.

When do we run out of all IPv4 addresses?
When all addresses have been allocated (coming 1-2 month?)  then each RIR may have a set of IPv4 addresses available for allocation to their customers. Based on the need, some RIR may be out of the available IP addresses very soon while others could have some more month before running out of IPv4 addresses.

Does it mean that IPv4 will not work anymore?
IPv4 will be serving networks in some decade(s) before it is completely replaced by IPv6. But remember that IPv6 is not backward compatible.

Urgent transition to IPv6, would it affect the quality of the transition?
The urgent transition could be expensive and in some case(s) leads to ugly solution for companies (as one of my IPv6 colleagues expressed). But still it is not too late.

I am pretty sure that many decision makers, network architects have already a good plan for their IPv6 transition since the signal is very loud and clear only 2,73% (7 blocks) are now available.


Available IPv4 Addresse by Nov. 30, 2010  Mohammad Mahloujian
Available IPv4 Addresses by Nov. 30, 2010 Mohammad Mahloujian

2 thoughts on “The end of the more than 30 years of IPv4

  1. Mohammad,

    We’ve discussed before about IPv6. I’ve said that there is a lack of incentives for ordinary companies to implement IPv6 and I asked you if there were any clear incentives for IPv6 for which I didn’t find your answer convincing. This is not a critique only that we see incentives for IPv6 differently.

    However, I work a lot with Windows based infrastructure and there is a growing interest for DirectAccess ( in Windows 2008 R2 a VPN technology allows windows workstations to authenticate to Active Directory ahead of user authentication. So that the workstation can receive Group Policies and set up a secure channel to a domain controller in Active Directory ahead of user authentication. The result is that the user experience is no different with DirectAccess from if the user would sit directly on the LAN.

    DirectAccess uses IPSec for it’s VPN’s. The good thing is that the computer channel and user channel of the VPN’s are implemented with IPv6 only. Hence to have use DirectAccess you need to use IPv6. Sure DirectAccess can use tunnels 6to4 or Teredo but the endpoints needs to talk IPv6.

    Coming back to incentives. Here we now have a real incentive for customers to invest in IPv6 and put pressure on their ISP’s to simplify their IPv6 access. Windows is virtually in every company, mobility of the workforce is growing and DirectAccess gives you as a customer/user a very good experience and the technology is included in Windows 2008 R2. This is what I mean with clear incentives.

    • Thanks alot for reading my blogs and for your comment.
      I am sorry if I was not able to convince you before. But as long as I discussed the need for IPv6, I have told that the needs for the VPN is almost eliminated by IPv6. Microsoft Direct access has been around for years and it is a great product (no, it is not commercial here). The MS Direct Access could use different tunnelling technique or the native IPv6. What I have experienced is the need for consequent IPv4 addresses (as I have been told by Microsoft), which is a bit confusing for some people.

      Back to your comments on incentives.
      I am pretty sure that you have studied the technical advantage of the IPv6 and are aware of what the IPv6 provides and assuming you are looking for business advantages. In order to find out IPv6 benefits for companies and organizations, business approach needs to be analysed, the AT&T in US providing IPTV to their customer by using IPv6, AT&T found it is as commercially stable, good future proof investment and a good business opportunity. I am afraid that there is no general and business ultimate incentive which is valid for each company. And the answer you are looking for is strictly dependent on the business opportunity the company may have.



Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s