inetnum: 2804:150::/30 aut-num: AS10954 abuse-c: CVTSO3 owner: SERVICO FEDERAL DE PROCESSAMENTO DE DADOS - SERPRO ownerid: 33.683.111/0001-07 responsible: Marcos Martins Melo country: BR owner-c: DVFOL3 tech-c: DVFOL3 inetrev: 2804:150:11::/48 nserver: antares.serpro.gov.br nsstat: 20180310 AA nslastaa: 20180310 nserver: trifid.serpro.gov.br nsstat: 20180310 AA nslastaa: 20180310 nserver: andromeda.serpro.gov.br nsstat: 20180310 AA nslastaa: 20180310 nserver: canisvenatici.serpro.gov.br nsstat: 20180310 AA nslastaa: 20180310 nserver: centauro.serpro.gov.br nsstat: 20180310 AA nslastaa: 20180310 created: 20110622 changed: 20180131 nic-hdl-br: DVFOL3 person: Davis Victor Feitosa de Oliveira e-mail: firstname.lastname@example.org country: BR created: 20171129 changed: 20171129 nic-hdl-br: CVTSO3 person: Caio Victor Tobias de Souza e-mail: email@example.com country: BR created: 20160805 changed: 20171018
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.