inet6num: 2a05,5480,,/29 netname: NL-INSPIRINGNETWORKS-20141103 country: NL org: ORG-INB11-RIPE admin-c: MU1757-RIPE tech-c: MU1757-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: MNT-INSPIRINGNETWORKS mnt-lower: nl-inspiringnetworks-1-mnt mnt-lower: MNT-INSPIRINGNETWORKS mnt-routes: nl-inspiringnetworks-1-mnt created: 2015-10-20T13,05,31Z last-modified: 2016-10-06T18,18,55Z source: RIPE organisation: ORG-INB11-RIPE org-name: Inspiring Networks BV org-type: LIR address: Kloosterweg 1 address: 6412 CN address: Heerlen address: NETHERLANDS e-mail: email@example.com admin-c: MU1757-RIPE tech-c: MU1757-RIPE abuse-c: AR33632-RIPE mnt-ref: nl-inspiringnetworks-1-mnt mnt-ref: MNT-INSPIRINGNETWORKS mnt-ref: RIPE-NCC-HM-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: MNT-INSPIRINGNETWORKS created: 2015-09-28T09,15,35Z last-modified: 2016-10-06T18,29,11Z source: RIPE phone: +31-85-2736450 person: Maikel Uerlings address: Gastersberg 10 address: 6372la address: LANDGRAAF address: NETHERLANDS phone: +31610379568 nic-hdl: MU1757-RIPE mnt-by: nl-inspiringnetworks-1-mnt created: 2015-09-28T09,15,34Z last-modified: 2015-09-28T09,15,35Z source: RIPE route6: 2a05,5480,,/29 origin: AS12506 mnt-by: nl-inspiringnetworks-1-mnt created: 2016-10-03T11,16,18Z last-modified: 2016-10-03T11,16,18Z 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.