inet6num: 2001,67c,518,,/48 netname: P33-IPv6-PI-1 country: DE org: ORG-pA263-RIPE admin-c: UT253-RIPE tech-c: UT253-RIPE status: ASSIGNED PI mnt-by: RIPE-NCC-END-MNT mnt-by: PLUSLINE-MNT mnt-by: PLANET33-MNT mnt-routes: PLANET33-MNT mnt-domains: PLANET33-MNT created: 2014-04-08T09,30,32Z last-modified: 2016-04-14T09,52,47Z source: RIPE sponsoring-org: ORG-PSG2-RIPE organisation: ORG-pA263-RIPE org-name: planet 33 AG org-type: OTHER address: Theresienstr. 33 e-mail: email@example.com abuse-c: AR18711-RIPE admin-c: UT253-RIPE mnt-ref: PLANET33-MNT mnt-by: PLANET33-MNT created: 2008-05-07T12,57,55Z last-modified: 2014-02-27T12,32,01Z source: RIPE person: Ulrich Theilacker address: planet 33 AG address: Hofmannstr. 52 address: D-81379 Muenchen address: Germany phone: +49 89 2060333 0 fax-no: +49 89 2060333 33 e-mail: firstname.lastname@example.org nic-hdl: UT253-RIPE notify: email@example.com mnt-by: PLUSLINE-MNT created: 2008-05-07T12,14,55Z last-modified: 2011-02-14T09,18,11Z source: RIPE route6: 2001,67c,518,,/48 descr: planet 33 AG origin: AS12306 mnt-by: PLUSLINE-MNT mnt-routes: PLANET33-MNT created: 2014-05-09T06,55,09Z last-modified: 2014-05-09T06,55,09Z 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.