Predicting when the entire Internet will completely switch to IPv6 is complicated and depends on multiple factors.

Although IPv6 adoption has gradually increased, the entire transition faces several challenges and variables:

1. IPv4 Completeness

One of the main reasons for the transition to IPv6 is the completeness of IPv4 addresses.

However, techniques such as the use of NAT (Network Address Translation) have allowed IPv4 to continue to be used more widely than originally anticipated. As these addresses run out, the pressure to migrate to IPv6 will increase.

2. Hardware and Software Support

Many older devices and systems do not support IPv6 or require updates to support it. The need to change or upgrade equipment can be a significant impediment, especially for businesses and users with legacy hardware.

3. Infrastructure Investment

The cost of upgrading network infrastructures to fully support IPv6 can be considerable. This includes not only physical upgrades but also training for IT staff in IPv6 management.

4. Compatibility and Coexistence

IPv4 and IPv6 are incompatible at the protocol level, meaning the transition must be managed using strategies such as dual stacking, tunneling, and protocol translations. These transition solutions also require investment and maintenance.

5. Policies and Regulations

In some regions, governments and regulatory bodies have begun to promote or even require the use of IPv6. These policies can accelerate adoption in those markets.

6. Awareness and Education

As more professionals and businesses realize the benefits of IPv6, such as greater built-in security, better routing performance, and auto-configuration, adoption could accelerate.

Current Projections

IPv6 adoption has been faster in some countries than others. For example, countries like India, the United States, and Germany have seen significant increases in IPv6 adoption, thanks to the efforts of large ISPs and technology companies.

According to data from Google and other entities that monitor the use of IPv6, more than 30% of global Internet traffic is already over IPv6.

Conclusion

Given the complexity of the global Internet infrastructure and the aforementioned challenges, a complete transition to IPv6 could still take several years or even decades.

The speed of adoption will continue to vary widely by region and by sector, being driven by technological, economic and regulatory need.

IPv4 and IPv6 will likely continue to coexist for an extended period before IPv6 completely dominates.