inetnum: 2800:a10:2001::/48 status: reallocated owner: VISIO RED SRL ownerid: AR-VRSR-LACNIC responsible: Yanchuk Taras address: Av. Quesada, 5904, piso 4, departamento B address: C1431ADB - CABA - BA country: AR phone: +54 91155601111  owner-c: YAT3 tech-c: YAT3 abuse-c: YAT3 created: 20180125 changed: 20180125 inetnum-up: 2800:a10::/32 nic-hdl: YAT3 person: Yanchuk Taras e-mail: admin@VISIO.RED address: av. Quesada, 5904, piso 4, departamento B address: C1431ADB - Ciudad Autónoma de Buenos Aires - Buenos Aires country: AR phone: +54 91155601111  created: 20170425 changed: 20180114
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.