inetnum: 2804:1bc::/32 aut-num: AS28122 abuse-c: JPH3 owner: Yahoo! do Brasil Internet Ltda. ownerid: 02.967.773/0001-77 responsible: Denúncias de Abusos country: BR owner-c: JPH3 tech-c: JPH3 inetrev: 2804:1bc::/32 nserver: ns1.yahoo.com nsstat: 20170305 AA nslastaa: 20170305 nserver: ns2.yahoo.com nsstat: 20170305 AA nslastaa: 20170305 nserver: ns3.yahoo.com nsstat: 20170305 AA nslastaa: 20170305 nserver: ns4.yahoo.com nsstat: 20170305 AA nslastaa: 20170305 nserver: ns5.yahoo.com nsstat: 20170305 AA nslastaa: 20170305 created: 20100816 changed: 20130308 nic-hdl-br: JPH3 person: Atendimento ao Usuário e-mail: email@example.com country: BR created: 19990401 changed: 20131212
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.