AS1251 FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO SÃO PAULO
2001:12d8::/32 - LFL4
inetnum: 2001:12d8::/32 status: assigned owner: FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO SÃO PAULO city: São Paulo country: BR owner-c: LFL4 tech-c: JMA8 abuse-c: JMA8 inetrev: 2001:12d8:80::/48 nserver: NS.SPRACE.ORG.BR nserver: NS1.ANSP.BR inetrev: 2001:12d8:81::/48 nserver: NS1.ANSP.BR nserver: NS2.ANSP.BR inetrev: 2001:12d8:88::/48 nserver: NS1.ANSP.BR nserver: NS2.ANSP.BR created: 2007-12-19 changed: 2013-03-08 source: LACNIC nic-hdl: JMA8 person: Jorge Marcos de Almeida e-mail: JMA8@NUMERACAO.REGISTRO.BR address: Av. das Nações Unidas, 11541, 7º andar address: 04578-000 - São Paulo - SP country: BR phone: +55 11 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.