inet6num: 2a00,17c8,,/32 netname: CH-POSTNETZ descr: Post CH AG country: CH admin-c: MH1723-RIPE tech-c: DE1397-RIPE status: ALLOCATED-BY-LIR mnt-by: POST-MNT created: 2016-08-16T08,16,12Z last-modified: 2016-08-17T15,58,29Z source: RIPE person: Daniel Eyholzer address: Post CH AG address: Informationstechnologie address: Netzwerkengineering address: Webergutstrasse 12 address: 3030 Bern (Zollikofen) address: Switzerland phone: +41 79 636 89 66 fax-no: +41 58 667 30 01 e-mail: email@example.com org: ORG-DSP1-RIPE notify: firstname.lastname@example.org nic-hdl: DE1397-RIPE mnt-by: POST-MNT created: 2011-10-26T15,02,25Z last-modified: 2013-08-28T07,52,34Z source: RIPE person: Martin Haussener address: Post CH AG address: Informationstechnologie address: Betrieb address: Webergutstrasse 12 address: 3030 Bern (Zollikofen) address: Switzerland phone: +41 58 338 66 56 fax-no: +41 58 667 58 22 e-mail: email@example.com org: ORG-DSP1-RIPE nic-hdl: MH1723-RIPE created: 2004-10-29T05,02,53Z last-modified: 2013-08-28T07,12,05Z source: RIPE mnt-by: POST-MNT route6: 2a00,17c8,,/32 descr: CH-POSTNETZ origin: AS12511 mnt-by: POST-MNT created: 2011-10-27T09,05,53Z last-modified: 2011-10-27T09,05,53Z 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.