inet6num: 2a00,1e88,4,,/48 netname: RTK-VOLGA-MRF-IPv6-NNOV descr: OJSC Rostelecom descr: IP address space for Nizhny Novgorod Branch country: RU admin-c: AVB77-RIPE tech-c: AVB77-RIPE status: ASSIGNED notify: firstname.lastname@example.org notify: email@example.com mnt-by: MNT-VOLGATELECOM mnt-by: NMTS-MNT mnt-lower: NMTS-MNT mnt-routes: NMTS-MNT mnt-domains: NMTS-MNT created: 2012-04-05T10,02,39Z last-modified: 2013-03-12T12,01,24Z source: RIPE person: Artem V. Balashov address: Internet department, PAO "Rostelecom" address: 11, Gagarina pt., Nizhny Novgorod, Russia, 603022 phone: +7 831 4345981 e-mail: firstname.lastname@example.org nic-hdl: AVB77-RIPE mnt-by: NMTS-MNT created: 2002-05-28T04,03,07Z last-modified: 2015-09-28T11,24,48Z source: RIPE route6: 2a00,1e88,4,,/48 descr: OJSC Rostelecom-Volga, Nizhny Novgorod branch descr: Autonomous System origin: AS25405 notify: email@example.com mnt-by: NMTS-MNT created: 2013-03-12T12,41,10Z last-modified: 2013-03-12T12,41,10Z 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.