inet6num: 2a02,5340,,/48 netname: Easy-NET1-IPV6 descr: Easyhost client network country: SE admin-c: JA3349-RIPE tech-c: JA3349-RIPE status: ALLOCATED-BY-LIR mnt-by: MNT-EASYHOST created: 2012-10-11T12,22,03Z last-modified: 2012-10-11T12,23,09Z source: RIPE mnt-routes: IP-ONLY-MNT mnt-domains: MNT-EASYHOST person: John Angelmo address: Easyhost Scandinavia AB address: Virdings allé 32C address: SE-754 50 Uppsala phone: +46200-567890 e-mail: firstname.lastname@example.org nic-hdl: JA3349-RIPE mnt-by: JA17084-MNT created: 2011-04-19T19,30,51Z last-modified: 2011-04-19T19,30,52Z source: RIPE route6: 2a02,5340,,/48 descr: Easyhost origin: AS12552 mnt-by: IP-ONLY-MNT created: 2012-10-11T12,28,06Z last-modified: 2012-10-11T12,28,06Z source: RIPE
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.