As IPv4 addresses become a scarce commodity it is possible to buy and sell them.

Amazon have recently announced they will stop including IPv4 addresses for free with instances and now charge by the hour, potentially leading more customers to buy their own IPs to use under amazons BYOIP police.

Price will be calculated by taking the average of per-day averages from https://auctions.ipv4.global/prior-sales for all days in January.