inet6num: 2a00,f30,,/48 netname: QNT-SPB-V6-1 descr: Saint-Petersburg descr: Quantum country: RU admin-c: PAS-RIPE tech-c: PAS-RIPE status: AGGREGATED-BY-LIR assignment-size: 64 mnt-by: AS12418-MNT created: 2013-10-08T09,11,41Z last-modified: 2013-10-08T09,11,41Z source: RIPE person: Piter A. Sazhenin address: Quantum Communications address: 21 n.r. Smolenka address: Saint-Petersburg phone: +7 812 3364000 fax-no: +7 812 3364000 e-mail: firstname.lastname@example.org e-mail: email@example.com nic-hdl: PAS-RIPE notify: firstname.lastname@example.org created: 2004-02-05T14,59,48Z last-modified: 2013-04-23T05,27,13Z source: RIPE mnt-by: QUANTUM-RIPE-MNT abuse-mailbox: email@example.com route6: 2a00,f30,,/48 descr: Saint-Petersburg Quantum origin: AS12418 mnt-by: AS12418-MNT created: 2013-10-08T09,04,19Z last-modified: 2013-10-08T09,04,19Z 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.