inet6num: 2a02,b50,,/32 netname: UK-INTERNAP-20090312 country: GB org: ORG-INSU1-RIPE admin-c: INO3-RIPE tech-c: INO3-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: INAP-MAINT-RIPE mnt-routes: INAP-MAINT-RIPE mnt-domains: INAP-MAINT-RIPE notify: firstname.lastname@example.org created: 2009-03-12T16,55,08Z last-modified: 2016-10-24T13,44,03Z source: RIPE organisation: ORG-INSU1-RIPE org-name: InterNAP Network Services U.K. Limited org-type: LIR address: 10 Frith Street address: W1D 3JF address: London address: UNITED KINGDOM phone: +1 877 843 4662 phone: +44 20 7296 2000 fax-no: +1 206 264 1833 e-mail: email@example.com abuse-c: AR17724-RIPE mnt-ref: INAP-MAINT-RIPE mnt-ref: RIPE-NCC-HM-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: INAP-MAINT-RIPE created: 2004-04-17T12,16,24Z last-modified: 2016-10-24T14,05,43Z source: RIPE admin-c: PS6396-RIPE role: Internap Network Operations address: 250 Williams Street address: Suite E100 address: Atlanta, GA 30303 USA phone: +1 404 302 9700 fax-no: +1 404 475 0520 e-mail: firstname.lastname@example.org remarks: trouble, http,//www.internap.com admin-c: INAP-RIPE tech-c: INAP-RIPE nic-hdl: INO3-RIPE notify: email@example.com mnt-by: INAP-MAINT-RIPE created: 2002-03-15T14,34,50Z last-modified: 2006-05-24T15,23,08Z 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.