inet6num: 2001,16a8,,/32 netname: IT-RMNET-20031223 country: IT org: ORG-RS2-RIPE admin-c: SR397-RIPE tech-c: SR397-RIPE tech-c: MT1102-RIPE status: ALLOCATED-BY-RIR notify: email@example.com mnt-by: RIPE-NCC-HM-MNT mnt-by: RMNET-MNT mnt-lower: RMNET-MNT mnt-routes: RMNET-MNT created: 2003-12-23T12,52,17Z last-modified: 2016-07-25T13,13,40Z source: RIPE organisation: ORG-RS2-RIPE org-name: RMnet S.R.L. org-type: LIR address: Via Castrocielo snc address: I-00131 address: Rome address: ITALY phone: +390687200886 fax-no: +390687200949 e-mail: LIR@rmnet.it admin-c: SR397-RIPE admin-c: MT1102-RIPE abuse-c: AR15878-RIPE mnt-ref: RIPE-NCC-HM-MNT mnt-ref: RMNET-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: RMNET-MNT created: 2004-04-17T11,33,36Z last-modified: 2016-07-25T13,13,39Z source: RIPE person: Matteo Tescione address: Via Annibale Maria di Francia 6, 00138 Roma address: RM - ITALY mnt-by: RMNET-MNT phone: +390687200886 fax-no: +390687200949 e-mail: firstname.lastname@example.org nic-hdl: MT1102-RIPE remarks: Person Object notify: email@example.com created: 2002-06-24T10,14,44Z last-modified: 2008-11-25T20,02,48Z source: RIPE person: Stefano Rotellini address: RMnet Communications address: Via Annibale Maria di Francia 6 address: I-00138 Roma address: Italy phone: +39 06 87135026 fax-no: +39 06 87135026 e-mail: firstname.lastname@example.org nic-hdl: SR397-RIPE mnt-by: RMNET-MNT created: 2002-08-21T12,33,12Z last-modified: 2008-11-25T19,52,24Z source: RIPE route6: 2001,16a8,,/32 descr: RMnet IPv6 Block origin: AS12533 mnt-by: RMNET-MNT created: 2011-05-04T12,58,38Z last-modified: 2011-05-04T12,58,38Z 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.