inet6num: 2001,67c,262c,,/48 netname: DUO-NET country: NL org: ORG-DUO1-RIPE admin-c: JJ3251-RIPE tech-c: RS12879-RIPE status: ASSIGNED PI mnt-by: RIPE-NCC-END-MNT mnt-by: SN-LIR-MNT mnt-routes: AS1103-MNT mnt-domains: SN-LIR-MNT created: 2012-01-04T10,24,44Z last-modified: 2016-04-14T08,43,12Z source: RIPE sponsoring-org: ORG-Sb3-RIPE organisation: ORG-DUO1-RIPE org-name: Dienst Uitvoering Onderwijs org-type: OTHER address: Zernikelaan 16 address: 9747 AA Groningen address: The Netherlands e-mail: firstname.lastname@example.org abuse-c: ODCN1-RIPE mnt-ref: SN-LIR-MNT mnt-ref: LOGIUS mnt-ref: ODCN-MNT mnt-by: SN-LIR-MNT mnt-by: LOGIUS mnt-by: ODCN-MNT created: 2012-01-04T08,50,06Z last-modified: 2016-09-15T12,29,29Z source: RIPE person: Jaap Jansma address: Dienst Uitvoering Onderwijs address: The Netherlands phone: +31 50 599 98 39 fax-no: +31 50 599 98 50 e-mail: email@example.com nic-hdl: JJ3251-RIPE mnt-by: SN-LIR-MNT created: 2011-12-16T09,03,19Z last-modified: 2011-12-16T09,03,19Z source: RIPE person: Rene Schut address: Dienst Uitvoering Onderwijs address: The Netherlands phone: +31 50 599 99 20 fax-no: +31 50 599 98 50 e-mail: firstname.lastname@example.org nic-hdl: RS12879-RIPE mnt-by: SN-LIR-MNT mnt-by: LOGIUS created: 2011-12-16T09,06,56Z last-modified: 2016-07-25T09,05,20Z source: RIPE route6: 2001,67c,262c,,/48 descr: DUO-NET origin: AS1103 mnt-by: AS1103-MNT created: 2014-07-02T09,11,26Z last-modified: 2014-07-02T09,11,26Z 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.