The big residential ISPs were some of the first to go IPv6. Consider the issue of how to issue management IP addresses to 30 million cable modems, plus an unkno

The big residential ISPs were some of the first to go IPv6. Consider the issue of how to issue management IP addresses to 30 million cable modems, plus an unknown number of “other” managed devices like set top boxes: the 10. space only has 16 million addresses, so you have to have multiple parallel networks. Managing that is a lot of overhead. The conversion to IPv6 was considered cheaper than the alternative, so the big ones mostly did it 10-15 years ago.