inet6num: 2a02,4c00,,/29 netname: DE-NCORE-20110105 country: DE org: ORG-nG9-RIPE admin-c: LK-RIPE tech-c: LK-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: NCORE-NOC mnt-routes: NCORE-NOC notify: firstname.lastname@example.org created: 2016-10-26T08,33,35Z last-modified: 2016-10-26T08,33,35Z source: RIPE organisation: ORG-nG9-RIPE org-name: HKN GmbH org-type: LIR address: Hochstadenstr. 5 address: 47829 address: Krefeld address: GERMANY phone: +49 211 8755050 fax-no: +49 211 8755055 e-mail: email@example.com admin-c: LK-RIPE admin-c: TK-RIPE mnt-ref: NCORE-NOC mnt-ref: RIPE-NCC-HM-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: NCORE-NOC abuse-c: HH1700-RIPE created: 2004-04-17T11,10,31Z last-modified: 2016-09-29T13,09,03Z source: RIPE person: Lutz Knabenreich address: HKN GmbH address: Hochstadenstr. 5 address: 47829 Krefeld address: GERMANY phone: +49 211 8755050 fax-no: +49 211 87550555 e-mail: firstname.lastname@example.org abuse-mailbox: email@example.com nic-hdl: LK-RIPE remarks: * COMPLAINTS SENT TO OTHER CONTACTS THAN "abuse-mailbox" * remarks: * WILL BE DISCARDED SILENTLY AND UNREAD * remarks: notify: firstname.lastname@example.org mnt-by: NCORE-NOC created: 2002-07-05T12,46,40Z last-modified: 2014-07-02T12,31,06Z 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.