Why do we use IPv4 instead of IPv6?

Related questions

1. Why is my IPv6 not detected?
2. How do I enable IPv6 routing?
3. How do I disable IPv6?
4. Why you should not disable IPv6?
5. Why can't I get IPv6 connectivity?
6. Will IPv6 ever take off?
7. Will IPv6 ever happen?
8. What's faster IPv4 or IPv6?
9. Is it OK to turn off IPv6?
10. What is the purpose of IPv6?

Tags

1. #enabled
2. #internet
3. #protocol
4. #sport
5. #successor
6. #numerical
7. #major
8. #necessary
9. #unique
10. #utilizes
11. #functions
12. #provides
13. #difference
14. #however
15. #addresses
16. #devices
17. #similarly
18. #sixth
19. #revision
20. #communicate