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Message: <blockquote data-quote="imhotep" data-source="post: 26960209" data-attributes="member: 562115">Have already run out of IPv4 addresses.... RIPE NCC, Europe’s regional internet registry, on Nov 25 -2019, announced “We made our final /22 IPv4 allocation from the last remaining addresses in our available pool. We have now run out of IPv4 addresses.”NOTE: In April 2018, RIPE NCC announced it had allocated its last /8 block.  There are no more IPv4 addresses but there's a "Wait list" - to receive one /24 IPv4 allocation when addresses are returned in the future.This happens when businesses crash or they no longer needs them. Some organisations in fact reserved large blocks a very long time ago. In 2017 the bankrupt RadioShack chain auctioned off its public IPv4 addresses about 32,000-odd public addresses as part of its ongoing bankruptcy proceedings. So this type of recycling of IP addresses does occur.The change to IPv6 didn't happen as expected because of the reluctance to move on. But it has to happen now. Recently one of the co-fathers of the Internet (or rather TCP/IP), Vint Cerf himself made an appeal to the US Corporate sector to fast track. This is mainly due to the cost of implementation.With  IPv6, the IETF decided that, in order to implement new features in IPv6, the protocol would not be backward compatible with IPv4.IPv6 native devices are not capable of straightforwardly communicating with IPv4 devices. Now the IETF admits that they didn’t do a good enough job making sure native IPv6 devices and networks would be able to communicate with their IPv4-only counterparts when they designed the industry standard 13 years ago. The lack of real backwards compatibility for IPv4 was the single critical failure.The answer to your query lies in the methods used to extend the IPv4 addresses by using technologies like NAT, PAT, CGNAT (aka Large Scale NAT) etc. NAT is a superset of PAT. NAT offers dual features - address conservation & security. Please read on these if you are interested.</blockquote>

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