inet6num: 2a05,43c0,,/29 netname: CZ-DATONET-20141017 country: CZ org: ORG-DSL28-RIPE admin-c: DA7451-RIPE tech-c: DA7451-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: DATONET-RIPE mnt-routes: DATONET-RIPE created: 2014-10-17T08,06,57Z last-modified: 2017-01-06T13,59,09Z source: RIPE organisation: ORG-DSL28-RIPE org-name: DPT s.r.o. LLC org-type: LIR address: Namesti Premyslovcu 16 address: 28802 address: Nymburk address: CZECH REPUBLIC phone: +420602606790 e-mail: firstname.lastname@example.org abuse-c: AC28077-RIPE mnt-ref: DATONET-RIPE mnt-ref: RIPE-NCC-HM-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: DATONET-RIPE created: 2014-10-09T10,01,21Z last-modified: 2017-01-20T14,26,34Z source: RIPE admin-c: VP12610-RIPE role: Datonet Admin address: Namesti Premyslovcu 16/9, 288 02 Nymburk e-mail: email@example.com abuse-mailbox: firstname.lastname@example.org admin-c: DN3662-RIPE admin-c: ZM1507-RIPE admin-c: VP12610-RIPE admin-c: PR15025-RIPE tech-c: ZM1507-RIPE tech-c: VP12610-RIPE tech-c: PR15025-RIPE nic-hdl: DA7451-RIPE mnt-by: DATONET-RIPE created: 2017-01-06T13,53,32Z last-modified: 2017-01-06T13,53,32Z source: RIPE route6: 2a05,43c0,,/29 origin: AS12570 mnt-by: DATONET-RIPE created: 2017-01-03T10,16,09Z last-modified: 2017-01-03T10,16,09Z 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.