Thats how Akamai and other "Edge" content distribution networks work. The DNS name that you request is static, the IP address returned is the "closest" CDN to you, to get the best speed etc.

The actual website address is a compound numerical IP address for instance, 192.0.2.1 but because of the domain name system (DNS), it has become easier for users to enter friendly domain names and ...

Fast flux works by cycling through a range of IP addresses and domain names that these botnets use to connect to the Internet. In some cases, IPs and domain names change every day or two ...