RIPE NCC Down to Last /8 IPv4 Block


A new milestone in IPv4 exhaustion history:

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RIPE NCC, the Regional Internet Registry (RIR) for Europe, the Middle East and parts of Asia, has announced that it is down to its last /8 IPv4 block on 14 Sept 2012.

This makes RIPE NCC the 2nd RIR after APNIC (Asia Pacific Network Information Centre) to have reached their last /8 IPv4 block.

With 2 out of 5 RIRs having nearly exhausted their IPv4 address pools, this event highlights the imminence of IPv4 exhaustion and the urgent need for IPv6 transition.

Background:

The IPv4 address supply chain looks like this: IANA –> RIRs –> ISPs –> you, me and businesses.

So what happens when we run completely dry of IPv4 addresses? Well, not to panic! Those of us already allocated IPv4 addresses will function as we do today. However, new Internet users or websites will have to run on IPv6 – the new version of Internet protocol. Unfortunately, IPv6 wasn’t designed to be compatible with IPv4, so it may be possible that IPv6 users may not be able to visit IPv4 websites, and IPv4 users can’t visit IPv6 websites, unless some form of interoperability is implemented by either the user of the website. Some example interoperability techniques include dual stacks, and tunnelling – IPv6-in-IPv4 (e.g. 6-to-4, 6rd, protocol 41), IPv4-in-IPv6, IPv6-in-UDP (Teredo, TSP).

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