inetnum: 2001:12c0::/32 aut-num: AS11706 abuse-c: ABT82 owner: Terra Networks Brasil S.A. ownerid: 91.088.328/0001-67 responsible: Hostmaster Terra Networks country: BR owner-c: MPL4 tech-c: ENRED7 inetrev: 2001:12c0::/32 nserver: a.dns.terra.com nsstat: 20170305 AA nslastaa: 20170305 nserver: b.dns.terra.com.br nsstat: 20170305 AA nslastaa: 20170305 nserver: c.dns.terra.com nsstat: 20170305 AA nslastaa: 20170305 nserver: d.dns.terra.com.br nsstat: 20170305 AA nslastaa: 20170305 created: 20081031 changed: 20130521 nic-hdl-br: MPL4 person: Hostmaster Terra Networks e-mail: email@example.com country: BR created: 19980122 changed: 20170109 nic-hdl-br: ABT82 person: Abuse Terra e-mail: firstname.lastname@example.org country: BR created: 20050311 changed: 20120823 nic-hdl-br: ENRED7 person: Engenharia de Redes e-mail: email@example.com country: BR created: 20130521 changed: 20170111
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.