inetnum: 2800:240::/32 status: allocated aut-num: N/A owner: Telefónica International Wholesale Services Argentina S.A. ownerid: AR-TIWS-LACNIC responsible: Marco Antonio Otero Bernardo address: Av. Corrientes, 330, Piso 1 address: 1043 - Ciudad de Buenos Aires - CF country: AR phone: +34 91 4830527  owner-c: MAB20 tech-c: MAB20 abuse-c: MAB20 created: 20080613 changed: 20080613 nic-hdl: MAB20 person: Marco Antonio Otero Bernardo e-mail: ip_coord.businesssolutions@TELEFONICA.COM address: Ronda de la Comunicación, s/n, Distrito C address: 28050 - Madrid - country: ES phone: +34 91 4830527  created: 20060606 changed: 20160809
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.