AS53137 TCA Internet
2804:33c:e000::/40 - JRF8
inetnum: 2804:33c::/32 status: allocated owner: TCA Internet city: Taquara country: BR owner-c: JRF8 tech-c: NTL8 abuse-c: NTL8 inetrev: 2804:33c::/32 nserver: NS6.TCA.NET.BR nserver: NS61.TCA.NET.BR created: 2010-12-22 changed: 2013-03-08 source: LACNIC nic-hdl: NTL8 person: NOC - TCA Informatica Ltda e-mail: NTL8@NUMERACAO.REGISTRO.BR address: Av. das Nações Unidas, 11541, 7º andar address: 04578-000 - Taquara - RS country: BR phone: +55 51 55093511  created: 20130306 changed: 20130308
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.