inet6num: 2a00,10c8,,/32 netname: IT-INFOTN-20090709 country: IT org: ORG-ITS4-RIPE admin-c: TNCR1-RIPE abuse-c: TNCR1-RIPE tech-c: TNCR1-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: MNT-TNNET mnt-routes: MNT-TNNET notify: firstname.lastname@example.org created: 2009-07-09T12,37,48Z last-modified: 2017-11-14T13,36,06Z source: RIPE organisation: ORG-ITS4-RIPE org-name: Trentino Network S.r.l. org-type: LIR address: via G. Pedrotti 18 address: 38121 address: Trento address: ITALY phone: +390461020200 fax-no: +390461020201 e-mail: email@example.com admin-c: MG7176-RIPE admin-c: IF665-RIPE admin-c: DC11744-RIPE mnt-ref: RIPE-NCC-HM-MNT mnt-ref: MNT-TNNET mnt-by: RIPE-NCC-HM-MNT mnt-by: MNT-TNNET abuse-c: TNCR1-RIPE created: 2004-06-02T12,00,36Z last-modified: 2017-11-14T13,24,30Z source: RIPE role: Trentino Network Contact Role address: Via G.Pedrotti, 18 address: I - 38121 TRENTO e-mail: firstname.lastname@example.org abuse-mailbox: email@example.com admin-c: MG7176-RIPE tech-c: IF665-RIPE tech-c: DC11744-RIPE nic-hdl: TNCR1-RIPE mnt-by: MNT-TNNET created: 2007-06-18T13,18,00Z last-modified: 2017-11-14T13,18,50Z source: RIPE route6: 2a00,10c8,,/32 descr: Trentino Network srl origin: AS12835 notify: firstname.lastname@example.org mnt-by: MNT-TNNET created: 2009-07-09T16,23,42Z last-modified: 2009-07-09T16,23,42Z 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.