inet6num: 2a00,1978,,/32 netname: DE-XNCNET-20100113 country: DE org: ORG-XNCG1-RIPE admin-c: FB8-RIPE tech-c: FB8-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-lower: XNC-MNT mnt-routes: XNC-MNT notify: email@example.com created: 2010-01-13T08,11,44Z last-modified: 2016-04-14T09,38,14Z source: RIPE organisation: ORG-XNCG1-RIPE org-name: Xenologics Networks & Communications GmbH org-type: LIR address: Auf der Kaiserbitz 3 address: 51147 address: Koeln address: GERMANY phone: +49 2203 96960 fax-no: +49 2203 9696199 e-mail: firstname.lastname@example.org admin-c: FB8-RIPE mnt-ref: XNC-MNT mnt-ref: RIPE-NCC-HM-MNT mnt-by: RIPE-NCC-HM-MNT abuse-c: XNCA1-RIPE created: 2004-04-17T11,13,56Z last-modified: 2015-11-20T09,48,57Z source: RIPE person: Frank Bergknecht address: Xenologics Networks & Communications GmbH address: Auf der Kaiserbitz 3 address: D-51147 Koeln address: Germany phone: +49 2203 9696 0 fax-no: +49 2203 9696 199 e-mail: email@example.com nic-hdl: FB8-RIPE mnt-by: XNC-MNT created: 1970-01-01T00,00,00Z last-modified: 2007-05-09T10,00,44Z source: RIPE route6: 2a00,1978,,/32 descr: XNC GmbH origin: AS12579 mnt-by: XNC-MNT created: 2010-01-15T12,11,23Z last-modified: 2010-01-15T12,11,23Z 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.