2804:e30:40b::/48 - SBB8
inetnum: 2804:e30::/32 status: allocated owner: SKY SERVIÇOS DE BANDA LARGA LTDA city: Brasília country: BR owner-c: SBB8 tech-c: SBB8 abuse-c: SBB8 created: 2013-06-17 changed: 2018-07-26 source: LACNIC
IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.
Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.