inet6num: 2a06,9280,,/29 netname: CZ-PILSFREE-20150921 country: CZ org: ORG-PZS3-RIPE admin-c: PM18207-RIPE tech-c: PM18207-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: cz-pilsfree-1-mnt mnt-routes: cz-pilsfree-1-mnt created: 2015-09-21T15,02,34Z last-modified: 2017-03-23T10,30,49Z source: RIPE organisation: ORG-PZS3-RIPE org-name: PilsFree, z. s. org-type: LIR address: Tachovska 1373/41 address: 323 00 address: Plzen address: CZECH REPUBLIC e-mail: firstname.lastname@example.org admin-c: PM18207-RIPE tech-c: PM18207-RIPE abuse-c: AR33555-RIPE mnt-ref: cz-pilsfree-1-mnt mnt-by: RIPE-NCC-HM-MNT mnt-by: cz-pilsfree-1-mnt mnt-ref: RIPE-NCC-HM-MNT created: 2015-09-18T15,35,52Z last-modified: 2017-03-23T10,30,50Z source: RIPE phone: +420775163264 person: Pavel Muknsnabl address: Tachovska 1373/41 address: 323 00 address: Plzen address: CZECH REPUBLIC phone: +420775163264 nic-hdl: PM18207-RIPE mnt-by: cz-pilsfree-1-mnt created: 2015-09-18T15,35,51Z last-modified: 2015-09-18T15,35,52Z source: RIPE route6: 2a06,9280,,/29 descr: PilsFree, z.s. origin: AS12984 mnt-by: cz-pilsfree-1-mnt created: 2015-10-14T08,55,23Z last-modified: 2015-10-14T08,55,23Z 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.