inet6num: 2a04,4b00,,/29 netname: DE-NAVIGATEIT-20130710 country: DE org: ORG-NISG3-RIPE admin-c: MR17155-RIPE tech-c: MR17155-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: MR47323-MNT notify: email@example.com mnt-routes: TXX-MNT created: 2013-07-10T13,43,13Z last-modified: 2017-01-13T16,48,40Z source: RIPE organisation: ORG-NISG3-RIPE org-name: Navigate IT Services GmbH org-type: LIR address: Waldstr. 41-43 address: 76133 address: Karlsruhe address: GERMANY phone: +4972166249990 fax-no: +49721662499910 e-mail: firstname.lastname@example.org mnt-ref: MR47323-MNT mnt-ref: RIPE-NCC-HM-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: MR47323-MNT abuse-mailbox: email@example.com tech-c: NITC1-RIPE abuse-c: NITC1-RIPE created: 2013-07-09T14,44,07Z last-modified: 2016-09-29T12,51,35Z source: RIPE person: Roland Loeffler address: Waldstr. 41-43 address: 76133 Karlsruhe phone: +4972166249990 e-mail: firstname.lastname@example.org nic-hdl: MR17155-RIPE mnt-by: MR47323-MNT created: 2013-07-09T14,49,26Z last-modified: 2015-08-10T12,23,07Z source: RIPE route6: 2a04,4b00,,/29 descr: via TXX origin: AS12843 mnt-by: TXX-MNT created: 2014-04-01T11,36,13Z last-modified: 2014-04-01T11,36,13Z 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.