inet6num: 2001,67c,1028,,/47 netname: GRAWEHR-net2 country: CH org: ORG-AG101-RIPE admin-c: AG2596-RIPE tech-c: AG2596-RIPE status: ASSIGNED PI mnt-by: RIPE-NCC-END-MNT mnt-by: AS12553-MNT mnt-by: KSZ-CH-MNT mnt-routes: AS12553-MNT mnt-domains: AS12553-MNT notify: firstname.lastname@example.org created: 2010-11-25T09,35,42Z last-modified: 2016-04-14T09,50,27Z source: RIPE sponsoring-org: ORG-KZ1-RIPE organisation: ORG-AG101-RIPE org-name: Andreas Grawehr org-type: OTHER address: Postfach 2530 address: 6302 Zug address: Switzerland e-mail: email@example.com abuse-c: AR22312-RIPE notify: firstname.lastname@example.org mnt-ref: AS12553-MNT mnt-by: AS12553-MNT created: 2013-08-18T18,54,34Z last-modified: 2014-09-29T08,20,34Z source: RIPE person: Andreas Grawehr address: Postfach 2530 address: CH-6302 Zug address: Switzerland phone: +41 41 763 6800 e-mail: email@example.com nic-hdl: AG2596-RIPE mnt-by: AS12553-MNT notify: firstname.lastname@example.org created: 2009-12-14T18,11,26Z last-modified: 2013-09-02T13,54,20Z source: RIPE route6: 2001,67c,1028,,/47 descr: GRAWEHR descr: Switzerland origin: AS12553 mnt-by: AS12553-MNT created: 2010-12-01T07,47,22Z last-modified: 2013-09-02T13,06,47Z 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.