AS53013 W I X NET DO BRASIL LTDA - ME
2804:574:a000::/35 - HDN
inetnum: 2804:574::/32 status: allocated owner: W I X NET DO BRASIL LTDA - ME city: Franca country: BR owner-c: HDN tech-c: HDN abuse-c: HDN inetrev: 2804:574::/32 nserver: NS250.QNAX.COM.BR nserver: NS251.QNAX.COM.BR created: 2011-07-05 changed: 2013-03-08 source: LACNIC nic-hdl: HDN person: Host Digital Network e-mail: HDN@NUMERACAO.REGISTRO.BR address: Av. das Nações Unidas, 11541, 7º andar address: 04578-000 - Franca - SP country: BR phone: +55 16 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.