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.