inet6num: 2a03,5dc0,6,,/48 netname: KUNET6 descr: Kyiv National Taras Shevchenko University country: UA admin-c: KLN-RIPE tech-c: KLN-RIPE mnt-domains: AS13032-MNT mnt-routes: AS13032-MNT status: ASSIGNED mnt-by: KIEVLINE-MNT created: 2015-12-22T08,13,49Z last-modified: 2015-12-22T08,19,38Z source: RIPE role: KIEVLINE NOC address: Pobedy ave., 68/1 address: 03113, Kiev address: Ukraine e-mail: firstname.lastname@example.org admin-c: AO-RIPE tech-c: SR8953-RIPE nic-hdl: KLN-RIPE notify: email@example.com mnt-by: KIEVLINE-MNT created: 2010-03-27T17,47,28Z last-modified: 2015-04-22T07,43,30Z source: RIPE route6: 2a03,5dc0,6,,/48 descr: Kyiv National Taras Shevchenko University origin: AS13032 mnt-routes: KIEVLINE-MNT mnt-by: AS13032-MNT created: 2015-12-25T19,09,51Z last-modified: 2015-12-25T19,09,51Z 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.