inet6num: 2a04,fbc0,,/29 netname: NL-ABN-AMRO-20140723 country: NL org: ORG-AAB1-RIPE admin-c: BK2881-RIPE tech-c: RVDH92-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: MNT-ABNAMRO mnt-routes: MNT-ABNAMRO notify: firstname.lastname@example.org created: 2014-07-23T12,35,56Z last-modified: 2017-01-06T12,07,02Z source: RIPE organisation: ORG-AAB1-RIPE org-name: ABN AMRO Bank N.V. org-type: LIR address: Eleanor Rooseveltlaan 1 address: 1183 CC address: Amstelveen address: NETHERLANDS phone: +31206297878 fax-no: +31206290700 mnt-ref: RIPE-NCC-HM-MNT mnt-ref: MNT-ABNAMRO mnt-by: RIPE-NCC-HM-MNT mnt-by: MNT-ABNAMRO admin-c: RVDH92-RIPE admin-c: BK2881-RIPE admin-c: SI2729-RIPE e-mail: email@example.com abuse-mailbox: firstname.lastname@example.org abuse-c: SI2729-RIPE created: 2004-04-17T11,39,56Z last-modified: 2017-01-06T12,07,12Z source: RIPE person: Bas van Krevelen address: Eleanor Rooseveltlaan 1 address: 11183 CC Amstelveen address: Noord-Holland address: The Netherlands phone: +31 20 6297878 e-mail: email@example.com nic-hdl: BK2881-RIPE mnt-by: BK84004-MNT created: 2012-07-11T15,09,36Z last-modified: 2012-07-11T15,09,38Z source: RIPE person: Rody van der Hoeven address: Eleanor Rooseveltlaan 1, Amstelveen phone: +31 20 3837754 nic-hdl: RVDH92-RIPE mnt-by: MNT-ABNAMRO created: 2013-07-04T09,05,40Z last-modified: 2013-07-04T09,05,40Z 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.