AS11419 Telefonica Data S.A.
2804:e00:8000::/35 - ART8
inetnum: 2804:e00::/32 status: allocated owner: Telefonica Data S.A. city: Barueri country: BR owner-c: ART8 tech-c: TIC6 abuse-c: ART8 inetrev: 2804:e00::/32 nserver: EDNS01.TICBRASIL.COM.BR nserver: EDNS02.TICBRASIL.COM.BR created: 2013-05-29 changed: 2014-11-11 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.