inet6num: 2001,4d60,,/32 netname: NL-VANCIS-20051006 country: NL org: ORG-SARA1-RIPE admin-c: VS6837-RIPE tech-c: VS6837-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: VANCIS-LIR-MNT mnt-routes: VANCIS-LIR-MNT mnt-domains: VANCIS-LIR-MNT notify: firstname.lastname@example.org created: 2005-10-06T15,05,14Z last-modified: 2017-03-24T09,07,15Z source: RIPE organisation: ORG-SARA1-RIPE org-name: Vancis C&MS B.V. org-type: LIR address: Science Park 402 address: 1098 XH address: Amsterdam address: NETHERLANDS phone: +31205606600 admin-c: MD2973-RIPE admin-c: HVA9-RIPE mnt-ref: RIPE-NCC-HM-MNT mnt-ref: VANCIS-LIR-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: VANCIS-LIR-MNT abuse-c: VS6837-RIPE tech-c: VS6837-RIPE abuse-mailbox: email@example.com created: 2004-11-02T14,29,18Z last-modified: 2017-03-24T09,07,18Z source: RIPE e-mail: firstname.lastname@example.org role: Vancis Servicedesk address: Science park 408 address: 1098 XH Amsterdam address: The Netherlands e-mail: email@example.com phone: +31 36 523 8080 admin-c: RvD38-RIPE tech-c: RvD38-RIPE tech-c: MD2973-RIPE mnt-by: VANCIS-LIR-MNT nic-hdl: VS6837-RIPE notify: firstname.lastname@example.org remarks: ================================= remarks: = for abuse issues, please mail = remarks: = email@example.com = remarks: ================================= abuse-mailbox: firstname.lastname@example.org created: 2012-12-31T10,20,52Z last-modified: 2013-10-21T16,12,46Z source: RIPE route6: 2001,4d60,,/32 descr: NL-VANCIS-20051006 origin: AS1126 notify: email@example.com mnt-by: VANCIS-LIR-MNT created: 2009-12-15T09,55,40Z last-modified: 2015-09-24T13,39,37Z 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.