inetnum: 2803:9300::/32 status: allocated aut-num: N/A owner: BIP Informatica de Gaston Pechieu ownerid: AR-BIGP-LACNIC responsible: Gaston Pechieu address: Av. Escalada de San Martin, 2844, -- address: 5400 - San Juan - SJ country: AR phone: +54 2 644262844  owner-c: GAP6 tech-c: GAP6 abuse-c: GAP6 created: 20130411 changed: 20130411 nic-hdl: GAP6 person: Gastón Péchieu e-mail: gpechieu@HOTMAIL.COM address: Remedios Escalada de San Martin Oeste, 2844, address: 5400 - San Juan - country: AR phone: +54 264 4308800  created: 20090326 changed: 20150808
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.