inet6num: 2a02,b000,,/23 netname: IT-IUNET-20120502 country: IT org: ORG-IA36-RIPE admin-c: FP453-RIPE tech-c: FP453-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: MNT-IUNET mnt-lower: MNT-IUNET mnt-routes: MNT-IUNET mnt-domains: AS1267-MNT remarks: Object managed by Flavio Palumbo created: 2012-05-02T11,11,14Z last-modified: 2017-06-19T09,39,35Z source: RIPE organisation: ORG-IA36-RIPE org-name: Wind Telecomunicazioni SpA org-type: LIR descr: IUNET address: Largo Metropolitana 5 address: 20017 address: RHO ( Milano ) address: ITALY phone: +39-02-3011-1 e-mail: firstname.lastname@example.org admin-c: FP453-RIPE tech-c: FP453-RIPE abuse-c: AR21142-RIPE mnt-ref: MNT-IUNET abuse-mailbox: email@example.com abuse-mailbox: firstname.lastname@example.org mnt-by: RIPE-NCC-HM-MNT mnt-ref: RIPE-NCC-HM-MNT mnt-by: MNT-IUNET created: 2004-04-17T11,32,05Z last-modified: 2016-06-14T07,50,46Z source: RIPE person: FLAVIO PALUMBO org: ORG-IA36-RIPE org: ORG-HA9-RIPE remarks: IP ENGINEERING FOR WINDTRE address: WINDTRE s.p.a address: Largo Metropolitana 5 address: 20017 - RHO ( MILANO ) address: ITALY mnt-by: MNT-IUNET phone: +39023011.1 nic-hdl: FP453-RIPE abuse-mailbox: email@example.com abuse-mailbox: firstname.lastname@example.org abuse-mailbox: email@example.com remarks: For any abuse write to the mailboxes above created: 1970-01-01T00,00,00Z last-modified: 2017-07-14T09,07,33Z source: RIPE route6: 2a02,b000,,/23 descr: Wind Telecomunicazioni S.p.A. IPV6 Route origin: AS1267 mnt-by: AS1267-MNT created: 2012-07-02T10,57,38Z last-modified: 2012-07-02T10,57,38Z 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.