inet6num: 2001,67c,2d8,,/48 notify: email@example.com netname: OENB-NET country: AT org: ORG-ON17-RIPE admin-c: JS7611-RIPE tech-c: OT785-RIPE status: ASSIGNED PI mnt-by: RIPE-NCC-END-MNT mnt-by: OENB-NET mnt-by: SIL-MNT mnt-routes: OENB-NET mnt-domains: OENB-NET created: 2010-09-07T10,36,32Z last-modified: 2016-04-14T09,05,16Z source: RIPE sponsoring-org: ORG-SSG1-RIPE organisation: ORG-ON17-RIPE org-name: Oesterreichische Nationalbank org-type: OTHER address: Otto-Wagner-Platz 3, 1090 Wien, Austria e-mail: firstname.lastname@example.org abuse-c: AR22712-RIPE mnt-ref: SIL-MNT mnt-by: SIL-MNT created: 2010-08-25T15,48,57Z last-modified: 2016-06-02T13,19,23Z source: RIPE role: OeNB Tech address: OeNB Vienna phone: +43 1 40420 2720 e-mail: email@example.com admin-c: JS7611-RIPE tech-c: GH4214-RIPE tech-c: TZ1458-RIPE nic-hdl: OT785-RIPE created: 1970-01-01T00,00,00Z last-modified: 2016-06-02T13,03,51Z source: RIPE mnt-by: OENB-NET person: Juergen Schwalbe mnt-by: OENB-NET address: Oesterreichische Nationalbank address: Rechenzentrum address: Otto Wagner Platz 3 address: A-1090 Wien phone: +43 1 40420 2722 fax-no: +43 1 40420 2798 nic-hdl: JS7611-RIPE created: 1970-01-01T00,00,00Z last-modified: 2015-09-04T08,15,16Z source: RIPE route6: 2001,67c,2d8,,/48 descr: Oesterreichische Nationalbank mnt-by: OENB-NET origin: AS13042 created: 2010-09-10T15,40,50Z last-modified: 2010-09-10T15,40,50Z 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.