inet6num: 2a00,d78,,/32 netname: NL-SIDN-20081031 country: NL org: ORG-SIDN1-RIPE admin-c: SIDN2 tech-c: SIDN1 status: ALLOCATED-BY-RIR notify: email@example.com mnt-by: RIPE-NCC-HM-MNT mnt-by: SIDN-MNT created: 2008-10-31T14,28,26Z last-modified: 2016-06-28T07,40,54Z source: RIPE organisation: ORG-SIDN1-RIPE org-name: Stichting Internet Domeinregistratie Nederland org-type: LIR address: Postbus 5022 address: 6802 EA address: Arnhem address: NETHERLANDS phone: +31263525500 fax-no: +31263525505 e-mail: firstname.lastname@example.org tech-c: SIDN1 admin-c: SIDN2 abuse-c: SIDN3 mnt-ref: RIPE-NCC-HM-MNT mnt-ref: SIDN-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: SIDN-MNT created: 2008-10-13T10,54,48Z last-modified: 2016-06-28T12,38,52Z source: RIPE role: SIDN netmaster address: Meander 501 address: PO Box 5022 address: 6802 EA Arnhem e-mail: email@example.com admin-c: SIDN2 tech-c: EH2570-RIPE tech-c: WS3633-RIPE nic-hdl: SIDN1 mnt-by: SIDN-MNT created: 2013-01-14T11,56,25Z last-modified: 2016-06-28T07,42,48Z source: RIPE role: SIDN admin address: Meander 501 address: PO Box 5022 address: 6802 EA Arnhem e-mail: firstname.lastname@example.org admin-c: JG6107-RIPE tech-c: SIDN1 nic-hdl: SIDN2 mnt-by: SIDN-MNT created: 2013-01-14T11,53,46Z last-modified: 2016-06-28T07,42,27Z source: RIPE route6: 2a00,d78,,/32 descr: NL-SIDN origin: AS1140 mnt-by: SIDN-MNT created: 2008-11-11T14,39,24Z last-modified: 2008-11-11T14,39,24Z 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.