inet6num: 2a00,4100,,/32 netname: DE-MANDALA-20110209 country: DE org: ORG-MIES1-RIPE admin-c: MB276-RIPE tech-c: MB276-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: MANDALA-MNT mnt-routes: MANDALA-MNT notify: firstname.lastname@example.org created: 2011-02-09T15,09,58Z last-modified: 2016-09-23T09,27,30Z source: RIPE organisation: ORG-MIES1-RIPE org-name: Mandala Internet EDV Service GmbH org-type: LIR address: Wendenring 1 address: 38114 address: Braunschweig address: GERMANY phone: +4953134890 fax-no: +495313489500 e-mail: M.Blum@mandala.de admin-c: MB276-RIPE admin-c: FB78-RIPE mnt-ref: MANDALA-MNT mnt-ref: RIPE-NCC-HM-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: MANDALA-MNT abuse-c: MAR1027-RIPE created: 2004-04-17T11,09,48Z last-modified: 2016-09-23T09,27,40Z source: RIPE person: Manfred Blum address: Mandala Internet EDV-Service GmbH address: Wendenring 1 address: D-38114 Braunschweig address: Germany phone: +49 531 34890 fax-no: +49 531 3489500 e-mail: M.Blum@mandala.de nic-hdl: MB276-RIPE mnt-by: MANDALA-MNT created: 2001-11-27T11,50,40Z last-modified: 2007-06-08T13,28,51Z source: RIPE route6: 2a00,4100,,/32 descr: Mandala-V6-Block origin: AS12460 mnt-by: MANDALA-MNT created: 2011-09-16T07,22,46Z last-modified: 2011-09-16T07,22,46Z 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.