inet6num: 2001,4de0,,/32 netname: NL-EWEKA-20051206 country: NL org: ORG-EIS3-RIPE admin-c: PB6260-RIPE tech-c: PS12989-RIPE tech-c: PB6260-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: EWEKA-MNT mnt-routes: EWEKA-MNT notify: firstname.lastname@example.org created: 2005-12-06T09,01,30Z last-modified: 2016-10-12T11,50,36Z source: RIPE organisation: ORG-EIS3-RIPE org-name: Eweka Internet Services B.V. org-type: LIR address: Staten Bolwerk 1 address: 2011MK address: Haarlem address: NETHERLANDS phone: +31 72 5640406 fax-no: +31 72 5645132 e-mail: email@example.com admin-c: PB6260-RIPE admin-c: PS12989-RIPE mnt-ref: eweka-mnt mnt-ref: RIPE-NCC-HM-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: EWEKA-MNT abuse-c: EAC43-RIPE created: 2004-04-17T11,41,02Z last-modified: 2016-10-12T08,13,23Z source: RIPE person: Paul Beers address: Eweka Internet Services B.V. address: Staten Bolwerk 1 address: 2011MK Haarlem address: The Netherlands phone: +31 88 422 56 36 nic-hdl: PB6260-RIPE mnt-by: EWEKA-MNT e-mail: firstname.lastname@example.org created: 2006-01-04T09,06,21Z last-modified: 2015-05-21T09,04,24Z source: RIPE person: Paul Soetens address: Eweka Internet Services B.V. address: Staten Bolwerk 1 address: 2011MK Haarlem address: The Netherlands phone: +31 88 422 56 36 nic-hdl: PS12989-RIPE mnt-by: EWEKA-MNT e-mail: email@example.com created: 2010-04-20T08,37,55Z last-modified: 2015-05-21T09,05,19Z source: RIPE route6: 2001,4de0,,/32 descr: Highwinds Network Group Inc origin: AS12989 mnt-by: HWNG-MNT created: 2006-03-27T22,05,24Z last-modified: 2008-06-25T13,51,27Z 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.