2001:67c:2f84::/48 - DE-LIGHTUPNET-20160215
inet6num: 2001,67c,2f84,,/48 netname: DE-LIGHTUPNET-20160215 country: DE org: ORG-SYGE1-RIPE sponsoring-org: ORG-lo1-RIPE admin-c: YVES-RIPE tech-c: YVES-RIPE status: ASSIGNED PI mnt-by: RIPE-NCC-END-MNT mnt-by: SYSTEMGEMISCH-MNT created: 2016-02-15T11,33,37Z last-modified: 2016-04-14T09,07,40Z source: RIPE organisation: ORG-SYGE1-RIPE org-name: Yves Goebel org-type: OTHER address: Mainzer Landstrasse 351-353 address: 60326 Frankfurt am Main e-mail: firstname.lastname@example.org abuse-c: AR21025-RIPE mnt-ref: SYSTEMGEMISCH-MNT mnt-by: SYSTEMGEMISCH-MNT created: 2007-11-06T14,44,56Z last-modified: 2014-05-27T15,12,50Z source: RIPE person: Yves Goebel remarks: --- address: Systemgemisch address: Mainzer Landstrasse 351-353 address: 60326 Frankfurt am Main address: GERMANY remarks: --- mnt-by: SYSTEMGEMISCH-MNT org: ORG-SYGE1-RIPE e-mail: email@example.com remarks: --- phone: +49 69 380 9767 030 nic-hdl: YVES-RIPE created: 2008-01-23T19,11,18Z last-modified: 2009-04-30T22,19,13Z 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.