inet6num: 2001,4ba8,,/29 netname: CZ-SELFNET-20081001 country: CZ org: ORG-CA8-RIPE admin-c: SN4577-RIPE tech-c: SN4577-RIPE status: ALLOCATED-BY-RIR remarks: Please report abuse -> firstname.lastname@example.org mnt-by: RIPE-NCC-HM-MNT mnt-by: MNET-IP-MNT mnt-routes: MNET-IP-MNT mnt-domains: MNET-IP-MNT created: 2014-09-16T13,05,50Z last-modified: 2016-10-10T07,46,15Z source: RIPE organisation: ORG-CA8-RIPE org-name: itself s.r.o. org-type: LIR address: Palavske namesti 11 address: 628 00 address: BRNO address: CZECH REPUBLIC phone: +420533383357 fax-no: +420533383334 e-mail: email@example.com mnt-ref: MNET-IP-MNT mnt-ref: RIPE-NCC-HM-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: MNET-IP-MNT admin-c: OS1525-RIPE admin-c: PV5421-RIPE admin-c: JV15-RIPE admin-c: LM4590-RIPE tech-c: SN4577-RIPE abuse-c: SN4577-RIPE created: 2004-04-17T11,04,50Z last-modified: 2016-09-29T12,03,53Z source: RIPE role: LIR admin @ ITself address: itself, spol. s r.o. Palavske namesti 11 Brno 628 00 The Czech Republic e-mail: firstname.lastname@example.org e-mail: email@example.com admin-c: JD644-RIPE admin-c: OS1525-RIPE admin-c: PV5421-RIPE admin-c: JV15-RIPE tech-c: OS1525-RIPE tech-c: PV5421-RIPE tech-c: JV15-RIPE abuse-mailbox: firstname.lastname@example.org nic-hdl: SN4577-RIPE mnt-by: MNET-IP-MNT created: 2012-10-24T07,26,30Z last-modified: 2016-10-20T09,44,56Z source: RIPE route6: 2001,4ba8,,/29 descr: CZECHBONE origin: AS12570 mnt-by: MNET-IP-MNT created: 2014-09-16T15,10,18Z last-modified: 2014-09-16T15,10,18Z 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.