2800:8::/48 - DLF
inetnum: 2800:8::/32 status: allocated aut-num: N/A owner: Netup S.A. ownerid: CL-NESA-LACNIC responsible: Andres Murua address: Av. del Valle, Of. 101., 928, Huechuraba address: 6760441 - Santiago - RM country: CL phone: +56 2 5889048  owner-c: DLF tech-c: DLF abuse-c: DLF inetrev: 2800:8::/48 nserver: DNS1.NETGLOBALIS.NET nsstat: 20170307 AA nslastaa: 20170307 nserver: DNS2.NETGLOBALIS.NET nsstat: 20170307 AA nslastaa: 20170307 created: 20051124 changed: 20051124 nic-hdl: DLF person: Felipe Santibañez e-mail: NETADMIN@NETGLOBALIS.NET address: Av. del Valle, 928, of. 101 address: 0000 - Santiago - RM country: CL phone: +56 2 25889000  created: 20020910 changed: 20161107
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.