inet6num: 2a02,48,,/32 netname: IS-ISLANDSSIMI-20080214 country: IS org: ORG-Ih2-RIPE admin-c: VFIS1-RIPE tech-c: VFIS1-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: VFIS-NET-MNT mnt-routes: VFIS-ROUTE-MNT notify: email@example.com created: 2008-02-14T16,17,07Z last-modified: 2016-11-14T17,18,20Z source: RIPE organisation: ORG-Ih2-RIPE org-name: Fjarskipti ehf org-type: LIR address: Armuli 13a address: 108 address: Reykjavik address: ICELAND phone: +3545999000 fax-no: +3545999001 e-mail: firstname.lastname@example.org abuse-c: AR13790-RIPE abuse-mailbox: email@example.com mnt-ref: VFIS-NET-MNT mnt-ref: RIPE-NCC-HM-MNT notify: firstname.lastname@example.org mnt-by: RIPE-NCC-HM-MNT mnt-by: VFIS-NET-MNT admin-c: PS3699-RIPE admin-c: SBL1-RIPE created: 2004-04-17T11,28,38Z last-modified: 2016-11-14T17,19,37Z source: RIPE role: Vodafone Iceland Routing and Transmission address: Skutuvogur 2 address: 104 Reykjavik address: Iceland e-mail: email@example.com abuse-mailbox: firstname.lastname@example.org phone: +354 599 9000 admin-c: SBL1-RIPE tech-c: SBL1-RIPE tech-c: BS6376-RIPE nic-hdl: VFIS1-RIPE mnt-by: VFIS-STAFF-MNT created: 2006-10-06T10,49,31Z last-modified: 2016-11-14T17,38,02Z source: RIPE route6: 2a02,48,,/32 descr: Vodafone Iceland Allocation origin: AS12969 mnt-by: VFIS-ROUTE-MNT mnt-lower: VFIS-ROUTE-MNT notify: email@example.com created: 2009-06-26T12,49,37Z last-modified: 2009-06-26T12,49,37Z 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.