inet6num: 2001,67c,404,,/48 netname: BWINPARTY-PI-NET country: AT org: ORG-BIEA1-RIPE admin-c: MR18853-RIPE tech-c: MR18853-RIPE status: ASSIGNED PI mnt-by: RIPE-NCC-END-MNT mnt-by: BETANDWIN-MNT mnt-by: AS1764-MNT mnt-routes: BETANDWIN-MNT mnt-routes: AS1764-MNT mnt-domains: BETANDWIN-MNT mnt-domains: AS1764-MNT created: 2014-02-04T10,42,16Z last-modified: 2016-04-14T09,50,14Z source: RIPE sponsoring-org: ORG-NLTU1-RIPE organisation: ORG-BIEA1-RIPE org-name: bwin.party services (Austria) GmbH org-type: OTHER address: Marxergasse 1b address: A-1030 Wien e-mail: firstname.lastname@example.org abuse-c: AR23922-RIPE admin-c: MR18853-RIPE tech-c: MR18853-RIPE notify: email@example.com mnt-ref: BETANDWIN-MNT mnt-by: BETANDWIN-MNT created: 2004-05-17T12,51,06Z last-modified: 2014-11-17T16,33,30Z source: RIPE person: Markus Roeglsperger address: Marxergasse 1b address: 1030 Vienna phone: +43 (0)50 858 nic-hdl: MR18853-RIPE mnt-by: BETANDWIN-MNT created: 2014-09-29T12,30,46Z last-modified: 2016-01-04T13,59,09Z source: RIPE route6: 2001,67c,404,,/48 descr: bwin Interactive Entertainment AG origin: AS13008 mnt-by: BETANDWIN-MNT created: 2014-02-13T08,06,03Z last-modified: 2014-02-13T08,06,03Z 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.