inet6num: 2001,67c,279c,,/48 netname: NL-KPN-BBT-20150804 country: NL org: ORG-SRVA1-RIPE sponsoring-org: ORG-KOVN1-RIPE admin-c: MP24014-RIPE admin-c: BC6010-RIPE tech-c: MP24014-RIPE tech-c: BVH123-RIPE mnt-routes: KPN-MNT status: ASSIGNED PI mnt-by: RIPE-NCC-END-MNT mnt-by: MNT-KPN-CUS mnt-by: KPN-MNT created: 2015-08-04T12,50,00Z last-modified: 2016-12-07T11,04,40Z source: RIPE organisation: ORG-SRVA1-RIPE org-name: Stichting Reinier van Arkel org-type: OTHER address: S HERTOGENBOSCH e-mail: email@example.com abuse-c: SRVA1-RIPE e-mail: firstname.lastname@example.org notify: email@example.com mnt-ref: MNT-KPN-CUS mnt-by: MNT-KPN-CUS created: 2015-05-19T06,27,07Z last-modified: 2016-02-15T07,37,08Z source: RIPE person: Bas Cools address: NL phone: +31736586141 nic-hdl: BC6010-RIPE mnt-by: AS286-MNT created: 2015-08-03T11,25,23Z last-modified: 2015-08-03T11,25,23Z source: RIPE person: Bas van Hemmen address: NL phone: +31736586136 nic-hdl: BVH123-RIPE mnt-by: AS286-MNT created: 2015-08-03T11,24,33Z last-modified: 2015-08-03T11,24,33Z source: RIPE person: Marc Peters address: NL e-mail: Marc.Peters@reiniervanarkel.nl phone: +31736586140 notify: firstname.lastname@example.org mnt-by: AS286-MNT nic-hdl: MP24014-RIPE created: 2012-09-13T16,38,48Z last-modified: 2015-08-03T11,20,40Z source: RIPE route6: 2001,67c,279c,,/48 origin: AS1136 mnt-by: KPN-MNT mnt-by: MNT-KPN-CUS created: 2016-12-07T11,10,33Z last-modified: 2016-12-07T11,10,33Z 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.