inetnum: 2800:620::/32 status: allocated aut-num: N/A owner: Net Uno, C.A. ownerid: VE-NUCA-LACNIC responsible: Alfredo Diaz address: Urb. Los Naranjos. Prolong. Av Sur 7. Qta Cabletel, 1, 1 address: 1061 - Caracas - DF country: VE phone: +58 212 9862020  owner-c: VIL4 tech-c: VIL4 abuse-c: VIL4 inetrev: 2800:620::/32 nserver: N1.NET-UNO.NET [lame - not published] nsstat: 20170306 FAIL nslastaa: 20140721 nserver: DNS2.NET-UNO.NET [lame - not published] nsstat: 20170306 FAIL nslastaa: 20140728 created: 20110208 changed: 20110208 nic-hdl: VIL4 person: Netuno IP e-mail: NOTIFICACIONESLACNIC@NETUNO.NET address: Urb Los Naranjos, Prolong Av Sur 7, Qta Cabletel, n/a, n/a address: 1061 - Caracas - DC country: VE phone: +58 212 7720008  created: 20070905 changed: 20141106
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.