inet6num: 2a06,6bc0,,/29 netname: SK-ACS-20150819 country: SK org: ORG-AL12-RIPE admin-c: ACSK-RIPE tech-c: acsk-ripe status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: ACS-SK-MNT mnt-routes: ACS-SK-MNT created: 2015-08-19T12,28,13Z last-modified: 2017-06-12T11,25,05Z source: RIPE organisation: ORG-AL12-RIPE org-name: ACS spol. s r. o. org-type: LIR address: Ruzova dolina 10 address: 82109 address: Bratislava address: SLOVAKIA phone: +421 2 32661100 fax-no: +421 2 52490196 e-mail: email@example.com abuse-c: AR17270-RIPE admin-c: ST4389-RIPE admin-c: TH350-RIPE admin-c: ACSK-RIPE mnt-ref: ACS-SK-MNT mnt-ref: RIPE-NCC-HM-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: ACS-SK-MNT created: 2004-04-17T12,05,58Z last-modified: 2017-06-12T11,25,06Z source: RIPE role: ACS SK address: ACS s.r.o. address: Ruzova dolina 10, 82109 Bratislava, Slovakia phone: +421 2 32661100 fax-no: +421 2 52490196 e-mail: firstname.lastname@example.org e-mail: email@example.com admin-c: TH350-RIPE tech-c: TH350-RIPE nic-hdl: ACSK-RIPE mnt-by: ACS-SK-MNT created: 2002-02-18T15,52,55Z last-modified: 2017-06-19T05,49,56Z source: RIPE route6: 2a06,6bc0,,/29 descr: ACS s.r.o - ISP origin: AS12905 mnt-by: ACS-SK-MNT created: 2015-10-09T11,12,22Z last-modified: 2015-10-09T11,12,22Z 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.