inetnum: 2800:ad0::/32 status: allocated aut-num: N/A owner: SetarNet ownerid: AW-SETA-LACNIC responsible: Edward Tromp address: Seroe Blanco Z/N, -, address: - - Oranjestad - country: AW phone: +297 5834000  owner-c: EDT2 tech-c: EDT2 abuse-c: EDT2 created: 20111024 changed: 20111024 nic-hdl: EDT2 person: Edward Tromp e-mail: hostmaster@SETARNET.AW address: J.E. Irausquinplein #7, -, address: - - Oranjestad - - country: AW phone: +297 5834000  created: 20030812 changed: 20060620
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.