List of assigned /8 IPv4 address blocks

Some large /8 blocks of IPv4 addresses, the former Class A network blocks, are assigned in whole to single organizations or related groups of organizations, either by the Internet Corporation for Assigned Names and Numbers (ICANN), through the Internet Assigned Numbers Authority (IANA), or a regional Internet registry. Each /8 block contains 2563 = 224 = 16,777,216 addresses, which covers the whole range of the last three delimited segments of an IP address.

Source: Wikipedia — List of assigned /8 IPv4 address blocks (CC BY-SA 4.0)