IPv4 addresses used to be free; now they're like $50 per address from an IPv4 broker. Many ISPs use Carrier Grade NAT, which conserves addresses but may reduce

IPv4 addresses used to be free; now they're like $50 per address from an IPv4 broker. Many ISPs use Carrier Grade NAT, which conserves addresses but may reduce performance. IPv6 may route packets more directly without a NAT in the way. Facebook once reported seeing a lot of devices where IPv6 is faster: https://www.internetsociety.org/blog/2015/04/facebook-news-feeds-load-20-40-faster-over-ipv6/ https://www.internetsociety.org/blog/2015/04/facebook-news-f...