inet6num: 2a02,2e0,3fe,,/48 netname: HEISE-NET descr: Heise Zeitschriften Verlag GmbH & Co. KG, Hannover country: DE admin-c: AS20016-RIPE tech-c: HHH40-RIPE status: ASSIGNED mnt-by: PLUSLINE-MNT notify: firstname.lastname@example.org mnt-by: PLUSLINE-MNT created: 2012-05-21T10,06,27Z last-modified: 2012-05-21T10,06,27Z source: RIPE role: Hostmaster Heinz Heise address: Heise Zeitschriften Verlag GmbH & Co. KG address: Karl-Wiechert-Allee 10 address: D-30625 Hannover address: Germany phone: +49.51153520 fax-no: +49.5115352479 e-mail: email@example.com admin-c: AS20016-RIPE tech-c: EP413-RIPE nic-hdl: HHH40-RIPE mnt-by: AS286-MNT mnt-by: IPH-MNT created: 1970-01-01T00,00,00Z last-modified: 2011-10-27T13,38,25Z source: RIPE person: Alfons Schraeder address: Heise Medien GmbH & Co. KG address: Karl-Wiechert-Allee 10 address: 30625 Hannover address: Germany phone: +49.51153520 fax-no: +49.5115352479 e-mail: firstname.lastname@example.org nic-hdl: AS20016-RIPE mnt-by: IPH-MNT created: 2011-10-13T15,54,52Z last-modified: 2015-04-01T16,10,47Z source: RIPE route6: 2a02,2e0,3fe,,/48 descr: Plus.line AG origin: AS12306 mnt-by: PLUSLINE-MNT created: 2016-05-31T08,51,18Z last-modified: 2016-05-31T08,51,18Z source: RIPE route6: 2a02,2e0,3fe,,/48 descr: Plus.line AG origin: AS20546 mnt-by: PLUSLINE-MNT created: 2016-05-19T13,24,17Z last-modified: 2016-05-19T13,24,17Z 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.