inetnum: 2800:820::/32 status: allocated aut-num: N/A owner: Interlink S.R.L. ownerid: AR-INSR5-LACNIC responsible: Interlink S.R.L. address: Corrientes, 161, address: 2000 - Rosario - SF country: AR phone: +54 341 4248123  owner-c: INS3 tech-c: INS3 abuse-c: INS3 inetrev: 2800:820::/32 nserver: NS1.INTERLINK.COM.AR nsstat: 20170305 AA nslastaa: 20170305 nserver: NS2.INTERLINK.COM.AR nsstat: 20170305 AA nslastaa: 20170305 created: 20110414 changed: 20110414 nic-hdl: INS3 person: Interlink S.R.L. e-mail: netmanager@INTERLINK.COM.AR address: Lamadrid, 468, Ed2 P1 address: 2000 - Rosario - SF country: AR phone: +54 341 5276650  created: 20021209 changed: 20161011
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.